[clang] Add retrieval of unary operator spelling and python bindings (PR #219983)

[Jannick Kremer via cfe-commits]

https://github.com/DeinAlptraum commented:

I'm only familiar with the Python bindings so I'm only reviewing that part. A few minor, mostly style comments, otherwise LGTM. Sorry for the delay.

Also CC @Endilll 

https://github.com/llvm/llvm-project/pull/219983