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

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0hDEADBEAF wrote:

> Yes, let's go for the latest version (15.0.7). We should also decide from what version we should start. AFAIK, `clangd` starts documenting from `clangd-11`. Do you have a version in your mind? I looked at `clang` [versioning](https://releases.llvm.org/) and probably 4 is the right place to start from because LLVM started to increase MAJOR version every new release opposed to MINOR version increase for each new `3.x.x` release.

Since my script is based on releases listed on this GitHub repository, the first version I got information from is the v7. However, I can modify it to get information from the version 4, it should not be too hard to fetch it.


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