Docs and MultiErlangC properties

[rodrigo-arenas]

This PR includes:

• Added the properties waiting_probability_params, service_level_params, achieved_occupancy_params, and required_positions_params in MultiErlangC to track in which combination order each method returns a solution.
• The queing module was renamed to queuing
• The shifts module was renamed to scheduling
• Docs for all the scheduling methods

[codecov[bot]]

Codecov Report

Merging #30 (15b711f) into main (5864e73) will increase coverage by 0.78%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #30      +/-   ##
===========================================
+ Coverage   99.21%   100.00%   +0.78%     
===========================================
  Files          10        10              
  Lines         254       257       +3     
===========================================
+ Hits          252       257       +5     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
pyworkforce/scheduling/utils.py	100.00% <ø> (ø)
pyworkforce/_version.py	100.00% <100.00%> (ø)
pyworkforce/queuing/erlang.py	100.00% <100.00%> (+2.08%)	:arrow_up:
pyworkforce/scheduling/__init__.py	100.00% <100.00%> (ø)
pyworkforce/scheduling/base.py	100.00% <100.00%> (ø)
pyworkforce/scheduling/shifts_selection.py	100.00% <100.00%> (ø)

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