[clang-tools-extra] [clang-tidy] Create a check for signed and unsigned integers comparison (PR #113144)

[Congcong Cai via cfe-commits]

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+.. title:: clang-tidy - modernize-use-integer-sign-comparison
+
+modernize-use-integer-sign-comparison
+=====================================
+
+Replace comparisons between signed and unsigned integers with their safe
+C++20 ``std::cmp_*`` alternative, if available.
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HerrCai0907 wrote:

Since the check is enabled for c++ standard before c++20. please give more information in doc. Otherwise someone will think it is a false positive in e.g. c++11

https://github.com/llvm/llvm-project/pull/113144