v0.3.0.RELEASE

• Shuffled configuration to correctly support Boot 1.x.
• Implemented monitoring for ExecutorService and Executor.
• Generalization of tag formatting for different monitoring backends.
• New @EnablePrometheusMetrics for simpler default Prometheus configuration.
• Added <T> T record(Supplier<T>) signature to Timer and LongTaskTimer, and renamed record(Callable<T> f) to recordCallable(Callable<T> f) because of SAM inference collision with the new Supplier based method.
• Split up the supplier of default tags for web interceptors into several classes according to the programming model (now WebmvcTagProvider, WebfluxTagProvider, RestTemplateTagProvider).
• Default tags for RouterFunctionMetrics are now built into that class.