Add .ui and .dev deps groups via poetry Bo

Since we eventually want to allow users to minimally deploy `pikerd`
service-tree (aka distributed cross host) installs, we need to offer
a "headless" deps group. Really this is just the core dep set minus Qt
and some aux search related libs (for now).

The new `.dev` group is for adding hacking and testing tools including
`xonsh` since that will eventually be our REPL of choice more then
likely B)

Oh, and fix the namespace path (was a typo) for the `ledger` CLI and
of course bump the lock file.