[Compass App] User name and profile picture

[miquelbeltran]

This PR completes the home screen, adding the username and the profile picture.

This feature follows the basic structure:

• Added repository, both local and remote.
• Added API call + API model.
• Added Domain model (reduced version only containing name and profile picture).
• Modified the ViewModel to obtain the user and expose it to the Widget.
• Updated Widget to display the username and profile picture.
• Added /user endpoint to server project.
• Updated widget tests, as well as integration tests.

The Compass App is basically completed with it. Maybe the next step is to merge it to the main branch? And then we can do a full review, remove TODOs and setup CI jobs.

Pre-launch Checklist

• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I read the Contributors Guide.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-devrel channel on Discord.

[ericwindmill]

Looks straight forward. LGTM.