Update DiffPatch 2.0!

[covers1624]

As it says on the tin, Update to DiffPatch 2.0.

Some of the changes in DiffPatch, nothing super major:

• Rewritten, unified folder/archive handling for inputs and outputs.
  • NG can leverage this in the future to map in FileTree's directly.
• Much better unit testing infrastructure.
• Changed package and maven group to io.codechicken
• Now distributed on Maven Central.
• Other misc cleanups I'm probably forgetting.

The main motivation for this was to resolve long-standing issues with installing both NeoGradle and ForgeGradle in separate submodules (due to Forge's non-binary compatible fork of DiffPatch), but it turned into a much larger and much needed rework.

[neoforged-pr-publishing]

• Publish PR to GitHub Packages