Parallelize limiting magnitude

[mcoughlin]

Add flag to parallelize limiting magnitude calculation.

[codecov]

Codecov Report

Merging #69 (1c539ab) into main (fae66df) will decrease coverage by 0.63%.
The diff coverage is 1.68%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   31.17%   30.54%   -0.64%     
==========================================
  Files          35       35              
  Lines        1639     1673      +34     
==========================================
  Hits          511      511              
- Misses       1128     1162      +34     

Impacted Files	Coverage Δ
dorado/scheduling/scripts/metrics.py	7.75% <0.00%> (-1.34%)	⬇️
dorado/scheduling/scripts/simsurvey.py	7.81% <3.03%> (-0.46%)	⬇️

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[mcoughlin]

Unit tests pass. Merging.