Add pattern support to cat command

[awseward]

Currently what we do is something like

nox cat indices | grep -e 'my_cool_index' -e 'status'

and if you don't remember to add the -e 'status' bit, you don't get column headers in the output.

Would be super handy to be able to provide a pattern to nox cat and have it dislpay the table filtered to matching indices/aliases so you don't have to even pipe to grep in the first place.

Context of motivation for this issue: