Be able to filter down things in the classic table

Ideally, we'd be able to apply all the normal Nushell table filters before showing the classic table, but that isn't really possible. What sort of flags can we give the classic table to filter down to a few things? May be we can at least have a flag to filter down to various groups.

Start at the classic table entry point and review its existing interface alongside Nushell's normal table-filter behavior. Decide which filtering flags or groups are in scope, then define how users can tell the filtering is complete.

Written by the indexing model from the issue text.