[clang] [libclang/python] Add equality comparison operators for File (PR #130383)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

@AaronBallman do you have a clue why equality comparison for in-memory files works differently compared to on-disk files?

https://github.com/llvm/llvm-project/pull/130383