Added SequentialSystem.spot_diagram() method to plot spot diagrams for each field angle.

[roytsmart]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.16%. Comparing base (9adb785) to head (b5ee22f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files         105      105           
  Lines        5253     5292   +39     
=======================================
+ Hits         5209     5248   +39     
  Misses         44       44           

Flag	Coverage Δ
unittests	99.16% <100.00%> (+<0.01%)	⬆️

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