[clang-tools-extra] [clang-tidy] Add portability-avoid-platform-specific-fundamental-types (PR #146970)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

Check makes sense to me! As a first iteration it's fine without autofix but I can imagine it will be hard for a codebase to enable this check given the large amount of things to fix. Maybe users can specify a mapping of wanted types via an option?

https://github.com/llvm/llvm-project/pull/146970