Add joshua run which does joshua start + joshua tail

[sfc-gh-almiller]

It'd be nice to have a single command which can start testing and wait on the results, instead of having to (manually or via scripting) feed the ensemble ID between the two commands.

[jzhou77]

Yes, this is nice to have. A work around is the following shell script:

j () 
{ 
    python3 -m joshua.joshua -C path/to/cluster_file "$@"
}

name=`j start --tarball input_dir/correctness.tar.gz | tail -n 1 | awk '{print $1}'` && j tail --errors --xml | tee output_dir/$name.xml