[clang-tools-extra] [clang-tidy] Add new modernize-string-find-startswith check (PR #72385)

[Oliver Stöneberg via cfe-commits]

firewave wrote:

> would be to support also endswith in same check

+1

On a side note: I will be looking into the related patterns and their performance soon as I am getting very strange code/performance when they are used outside of a benchmark - especially with Clang.

https://github.com/llvm/llvm-project/pull/72385