RFR: CODETOOLS-7903008: JMH: Support incremental annotation processing for Gradle Java plugin [v4]

[Taylor Wicksell]

> This change adds support for Gradle's [incremental annotation processing](https://docs.gradle.org/current/userguide/java_plugin.html#sec:incremental_annotation_processing). Without this support, developers using the JMH annotation processor in their Gradle projects will see their compilation time increased due to Gradle invalidating its incremental compilation cache.

Taylor Wicksell has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains one additional commit since the last revision:

  Adds support for Gradle's incremental annotation processing

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Changes:
  - all: https://git.openjdk.java.net/jmh/pull/43/files
  - new: https://git.openjdk.java.net/jmh/pull/43/files/05914fec..68220b2c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmh&pr=43&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jmh&pr=43&range=02-03

  Stats: 1006 lines in 54 files changed: 392 ins; 13 del; 601 mod
  Patch: https://git.openjdk.java.net/jmh/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/43/head:pull/43

PR: https://git.openjdk.java.net/jmh/pull/43