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

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owenca 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.

I'd handle `NumericLiteralCase` in a non-optional pass instead.

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