Add google analytic to the app

[VictorChenLi]

• [x] - Add package and track page view
• [x] - track user session on login
• [x] - track student send request times
• [x] - track student cancel request times
• [x] - track teacher switch topic times
• [x] - track teacher open classroom times
• [x] - track time spend on each screen
• [x] - track times open the instruction