[clang] [libclang/python] export libclang version to the bindings (PR #86931)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

Let me know when this is good to go to be merged.
Also, in the next PR avoid force-pushing to your branch, because it makes it harder for reviewers to compare versions of your PR. Everything will be squashed upon merging anyway.

https://github.com/llvm/llvm-project/pull/86931