- Extending Distutils::CompilerOpt to allow adding extra separate test cases
    related to a certain CPU feature without affecting its availability.

  - Add test cases for reduce intrinsics and AVX512BW mask operations, they can be
    reached through C #defentions NPY_HAVE_AVX512BW_MASK and NPY_HAVE_AVX512F_REDUCE.

  Implement new distutils class `CCompilerOpt`, used for handling
  the CPU/hardware optimization, starting from parsing the
  command arguments, to managing the relationship between the CPU baseline
  and dispatch-able features, also generating the required C headers
  and ending with compiling the sources with proper compiler's flags.

  `CCompilerOpt` mainly used as a helper class for `CCompiler`,
  and doesn't provide any runtime detection for the CPU features,
  instead only focuses on the compiler side, but it generates
  abstract C headers that can be used later for the final
  runtime dispatching process.