* ios: notifications service extension
* create notifications in NSE (WIP)
* refactor notifications to use in NSE
* prepend team ID to shared defaults name to silence the warning
* remove whitespace
* ios: get device token for push notifications
* ios: receive messages when background notification is received
* add notifications API, update simplexmq
* chat API to register and verify notification token
* update AppDelegate to recognize different notification types, update simplexmq
* core: api to enable periodic background notifications
* update simplexmq
* chat API to delete device notification token
* use base64url encoding in verification code
* update simplexmq for notifications