feat: Add support for Avatar sizes and images.

[DaemonCahill]

This PR adds support for custom avatar sizes and background images.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (57c37fd) to head (83941ac).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   99.77%   99.78%           
=======================================
  Files          26       26           
  Lines         900      928   +28     
  Branches       47       48    +1     
=======================================
+ Hits          898      926   +28     
  Misses          2        2           

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