Add authorizationStatus in permissions object

[chochihim]

Summary

I need to know whether user has determined the notification permission (i.e. whether user has went through the "Don't Allow/Allow' permission modal)

Test Plan

What's required for testing (prerequisites)?

What are the steps to reproduce (after prerequisites)?

Run the /example and press "show enabled permissions".

Before this commit:

{
    "alert": true,
    "badge": true,
    "sound": true,
    "lockScreen": true, 
    "notificationCenter": true,
}

After commit:

{
    "alert": true,
    "badge": true,
    "sound": true,
    "lockScreen": true, 
    "notificationCenter": true,
    "authorizationStatus": 0,
}

Compatibility

OS	Implemented
iOS	✅
Android	❌

Checklist

• I have tested this on a device and a simulator
• I added the documentation in README.md
• I mentioned this change in CHANGELOG.md
• I updated the typed files (TS and Flow)
• I added a sample use of the API in the example project (example/App.js)

[Naturalclar]

@chochihim Looks good to me!