Gkps tests

[elib20]

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Context: Creating tests for the bosonic backend.

Description of the Change:

• Adds bosonic backend to list of backends that get tested
• Ensures all relevant preexisting tests pass for the bosonic backend
• Writes some new tests for mbsqueezing, and for bosonicbackend.ops
• Adapts thermal state and multimode state preparation tests to bosonic backend
• Some of the test files appear to have large changes just from having run black on them

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[codecov[bot]]

Codecov Report

Merging #532 (34f0538) into gkps (590b069) will increase coverage by 0.16%. The diff coverage is 4.16%.

@@            Coverage Diff             @@
##             gkps     #532      +/-   ##
==========================================
+ Coverage   90.00%   90.17%   +0.16%     
==========================================
  Files          76       76              
  Lines        8374     8354      -20     
==========================================
- Hits         7537     7533       -4     
+ Misses        837      821      -16     

Impacted Files	Coverage Δ
strawberryfields/backends/bosonicbackend/ops.py	21.42% <0.00%> (+4.76%)	:arrow_up:
strawberryfields/backends/states.py	82.74% <0.00%> (-0.29%)	:arrow_down:
...trawberryfields/backends/bosonicbackend/backend.py	16.28% <5.55%> (-0.55%)	:arrow_down:

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