WIP: Add slew constraints using constraint programming

[lpsinger]

This is a work in progress showing how to incorporate slew constraints using docplex.cp (rather than docplex.mp). To test it, run this command:

dorado-scheduling examples/6.fits --roll-step '90 deg' --timeout 60 --skygrid-method sinusoidal --skygrid-step '36 deg2' -j -o examples/6.ecsv

[codecov]

Codecov Report

Merging #61 (eeb1f29) into main (1792adc) will increase coverage by 0.35%.
The diff coverage is 19.04%.

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   31.54%   31.90%   +0.35%     
==========================================
  Files          28       28              
  Lines        1344     1354      +10     
==========================================
+ Hits          424      432       +8     
- Misses        920      922       +2     

Impacted Files	Coverage Δ
dorado/scheduling/scripts/main.py	14.96% <19.04%> (+5.55%)	⬆️

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