Allow the user to define filtering rules for notifications by sending
account:
- Not followed
- Younger than 30d
- Limited by moderators
and a policy for each of either show, warn, or hide.
To do this:
## Manage followers
- Create a new `FollowingAccountEntity`, to record accounts the logged
in account is following.
- Fetch the account's followers when an account is made active, and
persist to this table.
- Provide the followers as a property on `PachliAccount`
- Update this table if the user follows/unfollows accounts during normal
operation.
## Track account creation time
- Record account creation time in `TimelineAccount`.
## Track notification creation time
- Record notification creation time in `Notification`.
## API
- Always fetch all notifications, including those the server is
filtering.
## UX and storage for account filters
- Show a new Account preference to edit account notification filters.
- Display a dialog to manage account notification filters.
- Persist the user's choice to new properties in `AccountEntity`.
- New `AccountManager` methods to update the properties
## Filtering notifications
- New `NotificationFilter.filterNotificationByAccount()` method to make
the filtering decision based on the user's preferences.
- Use this in `NotificationFetcher` to filter notifications before
creating Android notifications.
- Use this in `NotificationsViewModel` to filter notifications before
display in `NotificationsFragment`.
## UX for filtered notifications
- Display filtered (with warning) notifications inline with other
notifications, with UI to disclose the notification or edit the filters.
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