WIP: Adjust exposure times for locally varying sky background

[lpsinger]

This is a quick and dirty implementation of adaptive exposure times that adjust for local variations in sky surface brightness.

Slew time constraints don't work with this yet.

Also there are a bunch of ad hoc command line arguments that need to be refactored.

[codecov]

Codecov Report

Attention: Patch coverage is 2.81690% with 69 lines in your changes are missing coverage. Please review.

Project coverage is 28.53%. Comparing base (f3f8784) to head (4466da1).
Report is 9 commits behind head on main.

❗ Current head 4466da1 differs from pull request most recent head 395cdc7. Consider uploading reports for the commit 395cdc7 to get more accurate results

Files	Patch %	Lines
...rado/scheduling/schedulers/continuous_time_slew.py	3.12%	62 Missing ⚠️
dorado/scheduling/scripts/main.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   28.78%   28.53%   -0.25%     
==========================================
  Files          35       35              
  Lines        1779     1801      +22     
==========================================
+ Hits          512      514       +2     
- Misses       1267     1287      +20     

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