[clang-tools-extra] [clang-tidy] add modernize-use-std-numbers (PR #66583)

[via cfe-commits]

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+.. title:: clang-tidy - modernize-use-std-numbers
+
+modernize-use-std-numbers
+=========================
+
+Finds constants and function calls to math functions that can be replaced
+with c++20's mathematical constants from the ``numbers`` header and offers
+fix-it hints.
+Does not match the use of variables with that value, and instead,
+offers a replacement at the definition of those variables.
+Function calls that match the pattern of how the constant is calculated are
+matched and replaced with the ``std::numbers`` constant.
+The use of macros gets replaced with the corresponding ``std::numbers``
+constant, instead of changing the macro definition.
+
+The following list of constants from the ``numbers`` header are supported:
+
+* e
----------------
EugeneZelenko wrote:

Please enclose each constant in double back-ticks.

https://github.com/llvm/llvm-project/pull/66583