feat: Send push notifications when patch bundles are updated

[KobeW50]

Feature description

Add an option to the ReVanced Manager settings that allows users to choose how often to check for updates to the user's patch bundles. There should be an option to never check.

Example screenshot from Bunny Manager

When an update is found, a push notification should be delivered to the user, informing the user which patch bundle has been updated.

Motivation

Currently, users need to open the Manager to see if patches have been updated. This can easily be forgotten by users.

Push notifications for updates is a useful utility for many, and it will promote people to keep their patched apps up-to-date.

Additional info

I opened a similar request over a year ago for the the Flutter Manager back when the Manager was early in development. The feature was not integrated due to the issue of needing to run in the background, and possibly other issues. See #902 for more information.

However, now that the Manager is being rebuilt in Compose, now is a good time to consider this feature that is standard in many similar apps.

Acknowledgements

• I have checked all open and closed feature requests and this is not a duplicate.
• I have chosen an appropriate title.
• The feature request is only related to ReVanced Manager.