Implement interface injection on NeoForge #211
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This was relatively easy to implement as ModDevGradle already supports interface injection, though with a slightly different format to Fabric's.
I also had to add an ItemHoverEventSource interface since custom classes with generic arguments (and on top of that an inner class as generic argument) don't work properly yet (see neoforged/JavaSourceTransformer#53).
Because of that, the mixin and fabric.mod.json were changed to that interface, as well.
This change should be able to be backported to older versions as well, but I don't think there exists a branch for the legacy 1.21 NeoForge codebase...? Either way, not a big deal since it's just explicit vs. implicit casts