[clang-tools-extra] [clang-tidy] add modernize-use-constexpr check (PR #162741)

[via cfe-commits]

Jens0mat wrote:

@5chmidti, any chance to finally get the review finished? Would be cool to finally have it available. Is it possible to ping the missing reviewers? 
@PiotrZSL @carlosgalvezp @vbvictor 

https://github.com/llvm/llvm-project/pull/162741