Bosonic engine results

[elib20]

Context: The bosonic backend is useful for simulating bosonic qubits.

Description of the Change:

• Fixes multiple measurement shots for the bosonic backend
• Raises error if symbolic non-Gaussian state prep is attempted in the bosonic backend
• Creates the BosonicEngine class
• Modifies the Results class to collect ancilla samples from measurement-based gates
• Adds/Creates Integration tests

Benefits: Running Programs on the bosonic backend from the frontend using an engine.

Possible Drawbacks:

Related GitHub Issues:

[codecov[bot]]

Codecov Report

Merging #546 (4d1087b) into master (618f59a) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #546      +/-   ##
==========================================
+ Coverage   98.19%   98.22%   +0.03%     
==========================================
  Files          76       76              
  Lines        8329     8360      +31     
==========================================
+ Hits         8179     8212      +33     
+ Misses        150      148       -2     

Impacted Files	Coverage Δ
strawberryfields/api/result.py	100.00% <100.00%> (ø)
...trawberryfields/backends/bosonicbackend/backend.py	100.00% <100.00%> (ø)
...ryfields/backends/bosonicbackend/bosoniccircuit.py	100.00% <100.00%> (ø)
strawberryfields/engine.py	96.36% <100.00%> (+0.22%)	:arrow_up:
strawberryfields/backends/states.py	99.83% <0.00%> (+0.33%)	:arrow_up:

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