Add a reference to gradle-cache-action to Java-Gradle configuration

[vlsi]

https://github.com/burrunan/gradle-cache-action is @actions/cache-based action for better caching when Gradle is used.

It comes with defaults, so there's no need to configure paths.

PS. I add the exclusion of !~/.gradle/wrapper/dists/**/gradle*.zip to the default configuration, as the file (100-150MiB) is used one time only (see gradle/gradle#3605), however, I include the change into the single PR to avoid unexpected merge conflicts between the two

[vlsi]

Just in case, the way to use gradle-cache-action would as follows, however, I'm not sure it needs to be added to actions/cache examples.

- uses: burrunan/gradle-cache-action@v1
  name: Build
  with:
    job-id: jdk${{ matrix.jdk }}
    arguments: --scan build