Get rid of NotificationIds

[pocmo]

I implemented NotificationIds and the extension method helpers, so that we could get a unique id for a tag. It turns out NotificationManager already has methods to additionally accept a tag: https://developer.android.com/reference/android/app/NotificationManager#notify(java.lang.String,%20int,%20android.app.Notification)

This means we could get rid of NotificationIds and the extension methods and use that directly.

┆Issue is synchronized with this Jira Task

[pocmo]

This existed since API 5 and I didn't know about it until @rocketsroger started using it. :)

[rocketsroger]

related issue to take a look at when removing NotificationIds
#5375