[clang-tools-extra] [clang-tidy] Add a new check 'modernize-use-string-view' (PR #172170)

[Baranov Victor via cfe-commits]

https://github.com/vbvictor approved this pull request.

LGTM, but please wait for @zeyi2 since he explicitly requested changes. (There was recent discussion about blocking review https://discourse.llvm.org/t/merging-prs-that-have-a-changes-requested-annotation-when-the-reviewer-is-away/89463).

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On a side note, we should not "request changes" explicitly unless it's a major blocker. 

https://github.com/llvm/llvm-project/pull/172170