[clang-tools-extra] [Clang-Tidy] Add google-runtime-float Clang-Tidy check (PR #156763)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

> I think this can go straight into `portability`. Also linking this recent related PR: #146970.

It could go there and then have an alias to `google` if wanted maybe? 

https://github.com/llvm/llvm-project/pull/156763