Consolidate Standard Schema implementations

[Not-Jayden]

I know there's currently 2 implementations of Standard Schema floating around (both in the example directory of this repo and on the TypeMap Validator class).

To me the Validator class seems like it could potentially just extend/implement the TypeBox TypeCheck class, as it's effectively just returning the same methods, sans Schema/Encode/Decode/ and adding Parse.

I guess my main question is: Can TypeCheck extend/implement Standard Schema so you don't need to add TypeMap as another dependency? Particularly seeing as it can all be implemented with the code inside the TypeBox package, and perhaps the StandardSchemaProps can be moved into this repo and imported from TypeMap package.

I think the only thing that would probably need to differ between the two packages is the vendor name, for backwards compatibility reasons, and probably use something like @sinclair/typebox/compiler for the vendor name in TypeCheck.

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Putting that to the side, I'd probably want to at least expose the Schema() method on the TypeMap Validator class, as I'm working on adding TypeMap support for it in the Standard JSON package, and doing schema.__check.Schema() on the Validator instance is a hack. I'd also look to add support for the TypeBox TypeCheck instance as well though if the above change is made^