Set up analytics

[vinayvenu]

Motivation

Shwaas uses Visual Studio AppCenter for analytics. Since Shwaas does not have a backing server, it is important for us to understand if there are any usage issues in the app, and figure out in general if there are improvements to be made in the algorithms.
AppCenter is being retired soon, and we will need an alternative. Firebase analytics is a good replacement.

Acceptance criteria

• AppCenter analytics is removed from Shwaas
• Firebase Analytics is added to Shwaas