Refactor/surface ray trace

[HarrisonKramer]

• minor refactor to make ray tracing in standard surface use polymorphism for ray types, rather than using isinstance checks
• no change to user-facing API

[codecov]

Codecov Report

❌ Patch coverage is 95.75758% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
optiland/multiconfig/multi_configuration.py	25.00%	3 Missing ⚠️
optiland/rays/base.py	50.00%	2 Missing ⚠️
optiland/fields/field_types/base.py	94.73%	1 Missing ⚠️
optiland/optic/optic.py	96.55%	1 Missing ⚠️

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
+ Coverage   93.08%   93.25%   +0.17%     
==========================================
  Files         316      318       +2     
  Lines       18716    18771      +55     
==========================================
+ Hits        17421    17505      +84     
+ Misses       1295     1266      -29     

Files with missing lines	Coverage Δ
optiland/analysis/jones_pupil.py	96.66% <100.00%> (ø)
optiland/fields/field_types/angle.py	100.00% <100.00%> (ø)
optiland/fields/field_types/object_height.py	66.66% <100.00%> (+1.14%)	⬆️
...tiland/fields/field_types/paraxial_image_height.py	77.46% <100.00%> (+0.32%)	⬆️
optiland/fields/field_types/real_image_height.py	96.29% <100.00%> (+0.03%)	⬆️
optiland/optic/__init__.py	100.00% <100.00%> (ø)
optiland/optic/optic_serializer.py	100.00% <100.00%> (ø)
optiland/optimization/variable/asphere_coeff.py	100.00% <100.00%> (ø)
optiland/optimization/variable/conic.py	100.00% <100.00%> (ø)
optiland/optimization/variable/index.py	100.00% <100.00%> (ø)
... and 15 more

... and 6 files with indirect coverage changes

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