Define slit transforms for image slicer IFUs and offset slits

[oczoske]

Description will follow.

Closes #919

[codecov]

Codecov Report

❌ Patch coverage is 27.30924% with 181 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.27%. Comparing base (376ed01) to head (10a7bdb).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
scopesim/effects/micado_ifu_trace_list.py	24.39%	93 Missing ⚠️
scopesim/effects/metis_lms_trace_list.py	3.92%	49 Missing ⚠️
scopesim/effects/spectral_trace_list.py	45.31%	35 Missing ⚠️
scopesim/effects/apertures.py	40.00%	3 Missing ⚠️
scopesim/effects/spectral_trace_list_utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #922      +/-   ##
==========================================
- Coverage   75.19%   74.27%   -0.93%     
==========================================
  Files          70       71       +1     
  Lines        9018     9184     +166     
==========================================
+ Hits         6781     6821      +40     
- Misses       2237     2363     +126     

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