[clang-tidy] Implement alphabetical order check (#166072)
The patch implements `clang-tidy-alphabetical-order-check.py`, a small
Python tool to normalize clang-tidy docs with deterministic ordering.
It currently checks these two files:
-
https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/docs/clang-tidy/checks/list.rst?plain=1
-
https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/docs/ReleaseNotes.rst?plain=1
Closes #166021
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Co-authored-by: EugeneZelenko <eugene.zelenko@gmail.com>
