[clang-tools-extra] [clang-tidy] support query based custom check (PR #131804)

[via cfe-commits]

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+====================================
+Query Based Custom Clang-Tidy Checks
+====================================
+
+Introduction
+============
+
+This page provides examples of how to add query based custom checks for
+:program:`clang-tidy`.
+
+Custom checks are based on clang-query syntax. Every custom checks will be
+registered in `custom` module to avoid name conflict. They can be enabled or
+disabled by the checks option like the builtin checks.
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EugeneZelenko wrote:

`built-in`?

https://github.com/llvm/llvm-project/pull/131804