[feature] Allow setting schedule per Group

[eyalpost]

Version and OS
0.48.01 docker

Is your feature request related to a problem? Please describe.
I really like the new Scheduler feature but it's going to be tedious to set it up for the pages I have.

Describe the solution you'd like
These pages are already grouped and so I would really love to see the option of setting the schedule per group

Additional context
In general, I think the more settings will be available on the group level, the better and easier it will be for us to maintain many pages - #2049