Enable stable config cache

[Goooler]

https://docs.gradle.org/7.6.1/userguide/configuration_cache.html

[Goooler]

https://github.com/diffplug/spotless/actions/runs/4274264364/jobs/7440768996

19 problems were found storing the configuration cache.
- Task `:lib-extra:spotbugsMain` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsCleanthat` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsCompatKtLint0Dot46Dot0` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsCompatKtLint0Dot47Dot0` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsCompatKtLint0Dot48Dot0` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsDiktat` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsFlexmark` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsGson` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsJackson` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsKtfmt` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsKtlint` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsMain` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsPalantirJavaFormat` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsScalafmt` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution
- Task `:lib:spotbugsSortPom` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution

https://github.com/diffplug/spotless/actions/runs/4274264364/jobs/7440768895

67 problems were found storing the configuration cache, 9 of which seem unique.
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:disallowed_types
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: cannot serialize object of type 'org.gradle.api.internal.tasks.DefaultSourceSet', a subtype of 'org.gradle.api.tasks.SourceSet', as these are not supported with the configuration cache.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:disallowed_types
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: cannot serialize object of type 'org.gradle.internal.io.LinePerThreadBufferingOutputStream', a subtype of 'java.io.OutputStream', as these are not supported with the configuration cache.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:disallowed_types
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: error writing value of type 'java.io.InputStreamReader'
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: value '[[Ljava.lang.Object;@22f86738, [Ljava.lang.Object;@d29a528, [Ljava.lang.Object;@5556b417, [Ljava.lang.Object;@125cb412, [Ljava.lang.Object;@737cd0c6]' failed Java Object Serialization
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:not_yet_implemented:java_serialization
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: value '[classpath, site]' failed Java Object Serialization
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:not_yet_implemented:java_serialization
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: value '[java.lang.Class, java.lang.ClassLoader, java.lang.Compiler, java.lang.InheritableThreadLocal, java.lang.Package, java.lang.Process, java.lang.Runtime, java.lang.RuntimePermission, java.lang.SecurityManager, java.lang.System, java.lang.Thread, java.lang.ThreadGroup, java.lang.ThreadLocal]' failed Java Object Serialization
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:not_yet_implemented:java_serialization
- Task `:plugin-maven:generateMavenPluginHelpMojoSources` of type `de.benediktritter.maven.plugin.development.task.GenerateHelpMojoSourcesTask`: value '[org.apache.velocity.runtime.log.AvalonLogChute, org.apache.velocity.runtime.log.Log4JLogChute, org.apache.velocity.runtime.log.CommonsLogLogChute, org.apache.velocity.runtime.log.ServletLogChute, org.apache.velocity.runtime.log.JdkLogChute]' failed Java Object Serialization
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:not_yet_implemented:java_serialization
- Task `:plugin-maven:spotbugsMain` of type `com.github.spotbugs.snom.SpotBugsTask`: invocation of 'Task.project' at execution time is unsupported.
  See https://docs.gradle.org/7.6.1/userguide/configuration_cache.html#config_cache:requirements:use_project_during_execution

[nedtwigg]

Thanks for the PR, if all these warnings go away we can merge this. But I'm quite disappointed that the config cache has become stable. I think the design is fatally flawed (#987), writing a Gradle plugin has become far more difficult for little benefit. It reminds me quite a bit of the Eclipse ecosystem when Eclipse 4 and "p2" were first proposed. P2 and E4 were ambitious systems that fundamentally could not deliver on what was promised, and the good parts of Eclipse eventually rotted to nothing due to the friction of the unmet and unmeetable promises of its "next-gen" components (e.g. gradle/gradle#13510 is not possible to implement, but plugin authors have to jump through onerous hoops anyway).

Gradle doesn't have an imminent competitor the same way that Eclipse did, but the configuration cache serialization requirement is imo a catastrophe for the ecosystem.

[Goooler]

Suppressed all errors on CI.

[nedtwigg]

Thanks for this, linking to all the issues tracking the configuration cache issues was very helpful.