[ty] Dataclass transform: neither frozen nor non-frozen (#23366)
## Summary
Implement the semantics described [here in the typing
spec](https://typing.python.org/en/latest/spec/dataclasses.html#dataclass-semantics):
> Frozen dataclasses cannot inherit from non-frozen dataclasses. A class
that has been decorated with `dataclass_transform` **is considered
neither frozen nor non-frozen**, thus allowing frozen classes to inherit
from it. Similarly, a class that directly specifies a metaclass that is
decorated with `dataclass_transform` is considered neither frozen nor
non-frozen.
## Test Plan
New Markdown tests for all flavors of `dataclass_transform`ers.
