Functionality for MOSAIC minimum viable product

[oczoske]

This PR implements Scopesim functionality that enables a very simple ETC-like implementation of MOSAIC. The main effect is MosaicSpectralTraceList, which collapses FOV cube to one-dimensional spectra by integrating over the fibre apertures and maps the 1D spectra onto the ImagePlane. The second new effect is MosaicCollapseSpectralTraces which adds up all the 1D spectra from the fibre bundle into a total spectrum. This is saved as a FITS table.
Since the effects are implemented in an instrument-specific manner, no existing functionality should be affected by this PR.
The PR has tests for the new Transform1D class but for the traces and trace lists it relies on tests for the parent classes.

[codecov]

Codecov Report

❌ Patch coverage is 38.92617% with 91 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.86%. Comparing base (886c349) to head (9c315d9).
⚠️ Report is 226 commits behind head on main.

Files with missing lines	Patch %	Lines
scopesim/effects/mosaic_trace_list.py	38.77%	90 Missing ⚠️
scopesim/effects/metis_lms_trace_list.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #796      +/-   ##
==========================================
- Coverage   75.88%   74.86%   -1.02%     
==========================================
  Files          70       69       -1     
  Lines        8629     8627       -2     
==========================================
- Hits         6548     6459      -89     
- Misses       2081     2168      +87     

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[teutoburg]

I assume you tested that it mostly does what it should. My two comments can be ignored. I also ignored any linting-based nitpicking for now. The failing docs build is unrelated and has been fixed on main, so no worries there either.