Add remote-info command

This shows information about a ref in a remote. Of particular interest
is the --log option which gives you a history which can be used
with update --commit=XXX to roll back an update.

Closes: #1174
Approved by: alexlarsson
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f