[FEATURE REQUEST] Set avatars for space members

[joragua]

To align the UI with the iOS app and the web, it would be great to display an avatar as the icon for space members (but not for groups). This is how it currently looks:

Android app	iOS app	Web

TASKS

• Research (if needed)
• Create branch feature/set_avatars_for_space_members
• Development tasks
  • Implement whatever
  • ...
  • Implement unit tests (if needed)
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch feature/set_avatars_for_space_members into master