Implement parametrized disk ("donut") function

[teutoburg]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 27.27273% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.51%. Comparing base (120cc0e) to head (c263f39).
⚠️ Report is 162 commits behind head on main.

Files with missing lines	Patch %	Lines
scopesim_templates/misc/donut.py	22.58%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   73.51%   72.51%   -1.01%     
==========================================
  Files          30       31       +1     
  Lines        1484     1517      +33     
==========================================
+ Hits         1091     1100       +9     
- Misses        393      417      +24     

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