allow sorting groups by date created and/or filter on groups created after some time

I'm trying to use awslogs to grab the name of the newest log group. It would be good to be able to sort by name, or add some "--after" in the get groups statement

Start at the awslogs command that implements the get groups statement and trace how it retrieves and presents log groups. Define whether sorting by creation date or filtering with an --after option is needed, then verify that the command can identify the newest groups as requested.

Written by the indexing model from the issue text.