[clang-tools-extra] [llvm] [clang-tidy] Introduced new option --dump-yaml-schema (PR #164412)

[Baranov Victor via llvm-commits]

vbvictor wrote:

General clang-tidy idea looks good, but it seems a little bit hard for the user to do all the needed steps.

Instead, I wonder if we could automatically install those files when user installs [clangd vscode extension](https://marketplace.visualstudio.com/items?itemName=llvm-vs-code-extensions.vscode-clangd). 
Basically, the extensions should "install" configs obtained by `clang-tidy --dump-yaml-schema` and `clangd --dump-yaml-schema` and the user will instantly get those schemas.

P.S. sorry, but I don't have capacity and experience to review "Support" patches, but happy to do the `clang-tidy` and look into `clangd` part.

https://github.com/llvm/llvm-project/pull/164412