[clang] [libclang/python] Add python binding for clang_Cursor_isAnonymousRecordDecl (PR #120483)

[Vlad Serebrennikov via cfe-commits]

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

You should add a release note and a PR description.
LGTM otherwise.

https://github.com/llvm/llvm-project/pull/120483