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

[Andy MacGregor via cfe-commits]

30Wedge wrote:

Addressed missed nits https://github.com/llvm/llvm-project/pull/151590#discussion_r2335328063, squashed commits and rebased onto main. Thank you all for the review comments.

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