Add missing attributes to json/decoder.pyi JSONDecoder

[b9788213]

self.parse_object = JSONObject
self.parse_array = JSONArray
self.parse_string = scanstring
self.memo = {}

parse_object: Callable[..., Any]
parse_array: Callable[..., Any]
parse_string: Callable[..., Any]
memo: dict[Any, Any]

Added missing attributes to json/decoder.pyi JSONDecoder class.

[srittau]

Thanks, but we should add the actual arguments and return types here. Same for the actual types in the memo dict. Alternatively, we could use Incomplete (from _typeshed) as a marker for now.

[b9788213]

Is there a good way to tell they are the same thing, or have we copy the signature of the functions

[srittau]

I think copying the signature is fine where that makes sense.

[b9788213]

JSONArray and JSONObject wasnt exits so i tried implenting it but its so complex

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉