[Experiment/WIP] Android notification improvements.

[KennyHuRadar]

Spike to improve android notifications in SDK

• first pass implementation to log app opened from radar notifications
  • we create a pending intent that will open the main activity of the app
  • we attach an extra flag that will allow the activity lifecycle receiver to detect app opens from notifications.
• adds content intent to define the on tap behavior
• draft implementation of summary notification

This exploration uncovered some area for future work and product improvements.

• better define the behavior of content taps
• better implementation of the summary notifications
• more robust logging of app opens

These product definitions should be made in conjunction with the upcoming notification builder work.

links to projects with similar implementations

• https://github.com/wix/react-native-notifications
• https://github.com/OneSignal/OneSignal-Android-SDK/tree/main