Move Anime Caching Logic to the shared NineAnimatorCommon library

[uttiya10]

By moving the caching logic to the shared library, we can use it in app extensions. However, there is still more work to be done in future PRs:

• We need to move the cache (and maybe other user data?) into a shared container so the main app and extensions can be in-sync.
• Currently, all notification related information is stored in the system's notification center. This means if the user we're to remove the notification, the new information cannot be displayed in-app (as its been removed). Currently, app extensions do not have access to posting notifications, so we might need to implement an alternative data store to handle new content updates.