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ab11dd08 - Improve `TypedDict` conversion logic for shadowed builtins and dunder methods (#5038)

Improve `TypedDict` conversion logic for shadowed builtins and dunder methods (#5038) ## Summary This PR (1) avoids flagging `TypedDict` and `NamedTuple` conversions when attributes are dunder methods, like `__dict__`, and (2) avoids flagging the `A003` shadowed-attribute rule for `TypedDict` classes at all, where it doesn't really apply (since those attributes are only accessed via subscripting anyway). Closes #5027.