[clang-tools-extra] [clang-tidy] Add more constexpr options to `readability-identifier-naming` (PR #162160)

[Congcong Cai via cfe-commits]

HerrCai0907 wrote:

I prefer `GlobalConstexprVariableCase` since `constexpr` also works for function.

https://github.com/llvm/llvm-project/pull/162160