Fix inheritance false positives with dataclasses/attrs

[JukkaL]

Multiple inheritance from dataclasses and attrs classes works at runtime,
so don't complain about __match_args__ or __attrs_attrs__ which tend
to have incompatible types in subclasses.

Fixes#12349. Fixes#12008. Fixes#12065.

[AlexWaygood]

Does this also fix the false positive in the following code, which currently prevents typeshed from adding __match_args__ annotations to stdlib/_ast.pyi (discussed here: #12203 (comment))?

classAST: __match_args__= () classstmt(AST): ... classAnnAssign(stmt): __match_args__= ('target', 'annotation', 'value', 'simple')

[JukkaL]

Does this also fix the false positive in the following code, ....

No, but it shouldn't be hard to also fix them.

[jhance]

It seems like it is not good that a plugin depends on a magic list in mypy. If it is possible to add a parameter similar to final (name TBD) that indicates the field is special in the same way __slots__ is, then that would be preferable (and also clearer because it doesn't centralize the list of special cases)

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

rotki (https://github.com/rotki/rotki) + rotkehlchen/chain/ethereum/modules/adex/adex.py:808: error: Unused "type: ignore" comment steam.py (https://github.com/Gobot1234/steam.py) - steam/profile.py:204: error: Cannot override final attribute "__match_args__" (previously declared in base class "EquippedProfileItems") [misc]- steam/profile.py:204: error: Cannot override writable attribute "__match_args__" with a final one [misc]- steam/profile.py:204: error: Definition of "__match_args__" in base class "ProfileInfo" is incompatible with definition in base class "EquippedProfileItems" [misc]