[clang-tools-extra] Adding first version for which clang-tidy checks and their options are available (PR #162937)

[Baranov Victor via cfe-commits]

vbvictor wrote:

Hi, right now I have limited ability to process everything, so I wouldn't answer to all questions, sorry. But I have some general comments on how we should proceed.

Let's go with small, separate PRs to focus on one thing at a time:

1. Upstream this script for review. In case someone notices a bug, we would be able to adjust the script and re-run on docs.
2. Make changes to `add_new_check.py` so that people generate new checks with proper versions
3. Run script on per-module basis to have fewer changes to review. Note that I don't think that we need "minor" and "patch" versions, we should go with only major version, like in clangd.

https://github.com/llvm/llvm-project/pull/162937