[clang-tools-extra] [clang-tidy][readability-container-contains] Extend to any class with contains (PR #107521)

[Nicolas van Kempen via cfe-commits]

nicovank wrote:

Pinging @vogelsgesang, @PiotrZSL, @5chmidti, @HerrCai0907, @carlosgalvezp for review.

I applied this modified version to llvm-project root, **554 files changed**, `check-all` passes. Almost all cases are moving from `count` to `contains`. How do you suggest putting up this PR for easier review? Split it up by top-level directory?

https://github.com/llvm/llvm-project/pull/107521