Move plot functions to Makie Extension

[felixcremer]

Also start to move to explicit imports instead of full module import.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.41%. Comparing base (19660b3) to head (4a2582d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
+ Coverage   66.28%   66.41%   +0.12%     
==========================================
  Files           3        4       +1     
  Lines         264      262       -2     
==========================================
- Hits          175      174       -1     
+ Misses         89       88       -1     

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