Define slit transforms for image slicer IFUs and offset slits

[oczoske]

Description will follow.

[codecov]

Codecov Report

❌ Patch coverage is 9.52381% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.89%. Comparing base (39d4e0a) to head (e152938).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
scopesim/effects/spectral_trace_list.py	10.00%	9 Missing ⚠️
scopesim/effects/apertures.py	0.00%	7 Missing ⚠️
scopesim/effects/spectral_trace_list_utils.py	25.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (39d4e0a) and HEAD (e152938). Click for more details.

HEAD has 12 uploads less than BASE

Flag	BASE (39d4e0a)	HEAD (e152938)
	14	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #922       +/-   ##
===========================================
- Coverage   75.19%   29.89%   -45.31%     
===========================================
  Files          70       68        -2     
  Lines        9018     8865      -153     
===========================================
- Hits         6781     2650     -4131     
- Misses       2237     6215     +3978     

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