Support token-based APNS

[ben181231]

Tasks

• Support APNS token
• Support Accepting Bundle Info. / Topic when Device Registration
• Support Send Push Notification to Specific Bundle / Topic
• Collect Bundle Info. on iOS SDK
• Collect Bundle Info. on Android SDK
• Collect Bundle Info. on Javascript SDK
• Update push_devices and push_users on py-skygear

[royuen]

1. Use APNS token
2. Use APNS topic to decide which token to use.
3. If no APNS topic defined, default to send to first token / cert

[royuen]

• Verify if APNs auth key works like this:
  • Each team can use the same auth key for multiple apps (including sandbox and production)
• Support 1 APNs auth key / 1 APNs cert / 1 FCM
• Accept bundle_id in register device API
• SDKs - when register device, supply bundle ID (auto for iOS & Android, manual for JS on React Native case)
• SDKs - send push notification (param: user) => will send to all devices of the user with bundle ID stored in _device table
• SDKs - send push notification (param; user, bundle_id) => will send to all devices of the user with the bundle ID specified in param
• User need to do migration if they upgrade to us the new APNs auth key, to manually enter existing bundle id to _device table
• Send push notification in plugin would need to provide bundle id