Support JSON-schema as an input format

[ssalbdivad]

This would be a large feature allowing JSON schemas as an alternative definition format, that would be statically validated and inferred, similarly to the primary TS-based syntax.

Some additional investigation is needed to determine what roadblocks we might hit (I'm not deeply familiar with JSON schema), but it seems to be structurally quite straightforward, so it should lend itself well to a parse-based approach like ArkType.