[Integrate] As a user, I can cache the list of surveys

[Avishek Khan]

Why

For better performance and user experience, the surveys must be cached.

Acceptance Criteria

• Cache the surveys on the device, after fetching them successfully from the API
• Display surveys from cache, after the user relaunches the app
• Display surveys from API, if there's any difference with the cached data
• Add unit tests

Design

N/A

Resources

N/A