[clang] [clang-format] Add an option to format integer and float literal case (PR #151590)

[Andy MacGregor via cfe-commits]

30Wedge wrote:

Cool, thanks for hearing me out! I am working on handling `NumericLiteralCase` in the same pass as `IntegerLiteralSeparatorFixer`; that seemed natural since they both only modify single `numeric_constant` tokens. I won't have time to get to it until next week.

https://github.com/llvm/llvm-project/pull/151590