runs clang-tidy on specified files

    Usage: fx clang-tidy [--fix] [--verbose] [--target=TARGET|--files=FILES]

      --fix    Apply recommended fixes
      --target Run on a specified GN build target
      --files  List of files on which to run clang-tidy

[clang-tidy source code](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/devshell/contrib/clang-tidy)