import-private-name (PLC2701) does not respect @type_check_only

[Avasam]

import-private-name (PLC2701) says that

This rule ignores private name imports that are exclusively used in type annotations. Ideally, types would be public; however, this is not always possible when using third-party libraries.

However, it'll still trigger when the name is subclassed, but said class is decorated with typing.type_check_only in a stub file:
https://play.ruff.rs/658cc2b7-e7e0-4195-a19c-e1239a465e71

from _typeshed import SupportsWrite
from typing import Protocol, TypeVar, type_check_only
_T_contra = TypeVar("_T_contra", contravariant=True)

@type_check_only
class _Stream(SupportsWrite[_T_contra], Protocol):
    def seek(self, offset: int, whence: int = ..., /) -> int: ...

[MichaReiser]

Ruff doesn't support the @type_check_only decorator yet. So a first step would be to add support for it and then go through all the rules that need changing.