Add happi rename and also fix happi edit of 'name' field

[klauer]

Expected Behavior

Add CLI entrypoint for easy renaming:
$ happi rename at2l0 at2l0_foobar
or perhaps
$ happi rename at2l0=at2l0_foobar at1k4=at1k4_foobar

This would update the 'name' field, the internal '_id', and the parent JSON db key for that backend

Current Behavior

I believe this is how it'll work as-is, but correct me if not:

• Renaming can potentially be done with happi edit
• But then happi repair (post ENH: Match Name to ID Field  #327) will reset the name to the id in the case of the JSON backend
• This leaves the only option for renaming to edit the JSON file

Possible Solution

Add new rename command and fix up happi edit
The backends may need a corresponding function for renaming