[Suggestion] DataFixer walker for capabilities

[williewillus]

Currently we can just register a fixer/walker for an existing IFixType and then trudge around in the raw compound looking for the capabilities subtag. This is tedious (every mod has to do a lot of boilerplate) and flaky (since it would break if Forge ever changed where caps are stored)

It would be nicer if Forge added an IFixType representing capabilities, then added walkers for LEVEL, PLAYER, CHUNK, BLOCK_ENTITY, ENTITY and ITEM_INSTANCE to automatically navigate to the cap tag and walk it.

[williewillus]

If this sounds like a good idea, I can get working on a PR

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