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

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

Please remove unnecessary comments that tell the same as code itself, speaking mostly about `registerMatchers`.

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