Android 13 support

[Amrit Kahlon]

I tried making a PR but was unsure how to show the prompt, for android 13 we need to specifically request permission from the user just like ios.

Some references:
https://developer.android.com/develop/ui/views/notifications/notification-permission#wait-to-show-prompt
https://stackoverflow.com/questions/72310162/how-do-i-request-push-notification-permissions-for-android-13

[Amrit Kahlon]

Almost there, here's what I got:

https://github.com/amritk/cordova-plugin-firebase-messaging

[Maxim Chemerisuk]

Fixed in v8.