ASF: remove gradle-wrapper.jar file to make ASF compliant

[ostinru]

Update Gradle scripts to match ASF compliance:

• Remove gradle wrapper from ASF Releases and leave it in git repository (mimic apache/calcite project).
• Fetch gradle wrapper during build phase (mimic apache/nessie)

Add checksum validation:

• add gradle wrapper and gradle distribution checksum validation. Checksums from https://gradle.org/release-checksums/

[tuhaihe]

Cool! Thanks @ostinru for your great work!

I know this PR is still in the draft, just a reminder in case we're missing, FYI:

• Maybe we can add the .github/workflows/gradle-wrapper-validation.yml
• Remove the file server/gradle/wrapper/gradle-wrapper.jar from the source code
• Can add a note in the README.md, like:

PXF does not vendor gradle-wrapper.jar in the source tree. When running make, you will download it from its official site.

[ostinru]

We can choose only one option from this two:

• Maybe we can add the .github/workflows/gradle-wrapper-validation.yml
• Remove the file server/gradle/wrapper/gradle-wrapper.jar from the source code

[tuhaihe]

We can choose only one option from this two:

• Maybe we can add the .github/workflows/gradle-wrapper-validation.yml
• Remove the file server/gradle/wrapper/gradle-wrapper.jar from the source code

Got it. As suggested by the Incubator PMC, we should choose the 2nd one, removing the .jar file completely. Thanks!

[ostinru]

Got it. As suggested by the Incubator PMC, we should choose the 2nd one, removing the .jar file completely. Thanks!

Done.

[tuhaihe]

Got it. As suggested by the Incubator PMC, we should choose the 2nd one, removing the .jar file completely. Thanks!

Done.

Cool! Will check this PR again later.