Brute force samplers

[nquesada]

Adds a number of methods for calculating the photon number distributions.

• Adds the ability to calculate the photon number distribution of a pure state or mixed state using generate_probabilities.

• Allows to update the photon number distirbution when undergoing loss by using update_probabilities_with_loss.

• Adds a brute force sampler photon_number_sampler that given a (multi-)mode photon number distribution generates photon number samples.

[codecov[bot]]

Codecov Report

Merging #152 into master will not change coverage by %. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #152   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          887       924   +37     
=========================================
+ Hits           887       924   +37     

Impacted Files	Coverage Δ
thewalrus/quantum.py	100.00% <100.00%> (ø)
thewalrus/samples.py	100.00% <100.00%> (ø)

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