Add ReadOnly support for TypedDicts

[sobolevn]

Refs #17264

I will add docs in a separate PR.

[ilevkivskyi]

Thanks! Looks good, I have few questions and suggestions.

[sobolevn]

I ended up with to_be_mutated property for an extra check from .update plugin to check_typeddict_call_with_kwargs (the only place where we can really do this check). It is not the nicest solution, but it seems good enough.

@ilevkivskyi thanks a lot for your review! You found several bugs that I've missed. Please, take a look again, once you have the time :)

[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

[EwoutH]

Thanks a lot for this effort!