Add type hints to csv.DictReader

[CodingPrakharKapoor]

No description provided.

[ghost]

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[bedevere-app]

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[auvipy]

I'm not sure if typing only contributions are encouraged in cpython? let me know if otherwise

[picnixz]

Sorry, but the standard library does not usually add typing to modules (some of them have typing, but that's essentially because they were based on 3rd-party libs first). This is usually the task of typeshed.

In addition, please consider opening issues first in the future before opening a PR as it could avoid creating un-necessary work in the event the proposal is rejected.