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

[Jannick Kremer via cfe-commits]

https://github.com/DeinAlptraum approved this pull request.

LGTM! @Endilll  did you want to take a look at this as well?

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