RFR: Adds support for Gradle's incremental annotation processing

[Dalibor Topic]

On Thu, 10 Jun 2021 17:53:42 GMT, Taylor Wicksell <github.com+301239+twicksell at openjdk.org> wrote:

> 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.

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