[clang] [clang][Python] Apply type annotations to Python (PR #173845)

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mikomikotaishi wrote:

> The rest are more questionable to me, so I'd like to see justification for them.

@Endilll is the concern with annotating variables? I do think generally speaking including this information is helpful for IDEs and in other places and generally conveys intent the most clearly.

https://github.com/llvm/llvm-project/pull/173845