feat: Add default retrieve handler when passing an id to commands

[blainekasten]

This enables a short hand retrieve by matching the id style as a heurestic to assume retrieve.

E.g., the following is now possible and shows the related command:

short	long
tg files file-xxx	tg files retrieve file-xxx
tg evals eval-xxxxx-xxx	tg evals retrieve eval-xxxxx-xxx
etc...

[zainhas]

what happens here if someone types tg files random_stuff or just tg files with no args?

first won't match the regex, we don't insert retrieve, and then we re-call parse_known_args on the same tokens, doesn't that route back into this same default handler?

in that case I feel like a nice DX thing would be to insert tg files list and get a full table of all previous files

[blainekasten]

So no, we are passing the "sub app" here, not the top level app. So the top level meta handler gets called only once.