Replace notifications toggle with a link to the settings app.

[pixlwave]

Fixes #2368. Depends on matrix-org/matrix-ios-kit#865.

Outdated:

• Removes the notifications toggle as it wasn't detecting some possible notification configurations, and proclaiming to the user that notifications were disabled when they weren't.
• Ensures that notifications are enabled on launch. This will guarantee that everything is set up if the user enables them in the settings app at a later date.
• Replaces the toggle cell with a link that opens up the Element section of the Settings app for easier configuration.

[pixlwave]

Enabling notifications with this PR implemented:

New_480.mov

The same, but using the old toggle:

Old_480.mov

[niquewoodhouse]

After discussing, we agreed that whilst this fixes a lot of issues with notifications, it makes the primary flow a bit harder - as to turn off notifications now would take a bit longer and more interactions. When someone is trying to turn on/off notifications, it's normally a time-sensitive task, and taking longer than expected there would be a new papercut.

We agreed to keep the exisitng toggle for the quick turn on off and introduce a way to device notifications.

Reference (as it is now, just for reference)

Option 1

Option 2

Option 3

[pixlwave]

Updated to include the original toggle as well as the new link to the system settings app. The behaviour of the old toggle has been updated to include support for background notifications.

NotificationSettings2-480p.mov

[niquewoodhouse]

@pixlwave could we amend to alert to be more actionable, with a cancel and a settings action that goes to the relevant device notifications?

[pixlwave]

Yep, much better!

NotificationsAlert-480p.mov

[niquewoodhouse]

lgtm

[pixlwave]

Summary of final changes:

• Updates the notifications toggle to detect modern notification configurations.
• Update alert when notifications have been disabled in the Settings app.
• Add a link to open the Element section of the Settings app for easier notification configuration.