[clang] [libclang/python] Add python bindings for PrintingPolicy (PR #120494)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

The failure reminds me of #122063, which was merged just 2 hours ago.
Do you mind merging the `main` into your PR and try again?

https://github.com/llvm/llvm-project/pull/120494