Introduce emoji avatar creation screen. A follow up diff will handle navigating to this screen from the Profile screen
Design:
{F462950}
[[ https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=11195-257098&t=8v5tRNkURXuK8zcQ-4 | Link to Figma ]]
Depends on D7302