Allow configuring decompile cache size

[octylFractal]

I have a potentially niche request, that the decompile cache size be configurable. I am testing a project that decompiles all versions of Minecraft since 1.16.5, and this runs the cache out of space so the earlier versions lose their cached data, instead of holding it all. I would like to be able to disable or raise the limit in order to be able to reuse it. If this is just a system or Gradle property I can set, that would work for me.