Remove Groovy-ness in Visual Studio metadata generation

Some of the internal stuff for Visual Studio metadata generation (i.e. stuff in `org.gradle.ide.visualstudio.tasks.internal`) is implemented in Groovy. We should look into replacing this with Java.

Start by inspecting the internal Visual Studio metadata generation code under org.gradle.ide.visualstudio.tasks.internal and identify which parts are implemented in Groovy. Determine the scope of replacing those parts with Java; done means the internal implementation no longer relies on Groovy while preserving metadata generation behavior.

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