Create channel stats page
Start by adding some stats:
- Total channel members
- Total notifications sent
Future stats:
- General stats: total scheduled notifications, total notifications sent to mail, total notifications sent to push
- Notification stats: #to_email, #to_push, #read/unread, was scheduled?
- Add subscribed/unsubscribed members along the time
There are some problems with the fact that notifications (and related) are not on the state of EditChannelPage, but on NotificationsPage, so data will only be displayed if the user first visits the notifications page and then the Edit Channel page. It will be necessary to call the backend in the stats component, but the current endpoints fetch ALL channels, so it is necessary to create new endpoints and/or modifying the current models to have also this info on the response object and update the state if necessary. Using the current state will also show wrong information of the user first visit one channel notifications page and then goes directly to the edit channel page of another channel
As it was discussed it will be implemented on the Management Channel page (EditChannelPage)