Added package for Clara command line parser (#13763)
Added package for Clara command line parser (#13763)

* Added package for Clara command line parser
iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack