[clang] [libclang/python] Expose Rewriter to the python binding (PR #77269)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

> I have reviewed the tests for libclang and it appears that there are already tests for the rewriter, which are more extensive than the ones I wrote. Therefore, I have decided to mirror the tests from libclang in the Python binding. Please let me know if this approach is appropriate.

If you think that existing tests fully cover yours, then it's appropriate. Otherwise, we'd benefit from additional test coverage, but it's not necessarily in the scope of this PR.

https://github.com/llvm/llvm-project/pull/77269