Add vacuum modes to `TDMProgram`

[thisac]

Context:

Description of the Change:

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[codecov[bot]]

Codecov Report

Merging #698 (8b6864c) into master (670ee5f) will decrease coverage by 36.23%. The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master     #698       +/-   ##
===========================================
- Coverage   98.69%   62.46%   -36.24%     
===========================================
  Files          75       75               
  Lines        9212     9212               
===========================================
- Hits         9092     5754     -3338     
- Misses        120     3458     +3338     

Impacted Files	Coverage Δ
strawberryfields/tdm/tdmprogram.py	16.66% <0.00%> (-81.63%)	:arrow_down:
strawberryfields/io/xir_io.py	8.04% <0.00%> (-90.23%)	:arrow_down:
strawberryfields/apps/subgraph.py	10.11% <0.00%> (-89.89%)	:arrow_down:
strawberryfields/apps/clique.py	10.67% <0.00%> (-89.33%)	:arrow_down:
strawberryfields/apps/qchem/dynamics.py	12.65% <0.00%> (-87.35%)	:arrow_down:
strawberryfields/decompositions.py	12.11% <0.00%> (-87.34%)	:arrow_down:
strawberryfields/plot.py	13.15% <0.00%> (-85.09%)	:arrow_down:
strawberryfields/apps/qchem/utils.py	15.78% <0.00%> (-84.22%)	:arrow_down:
strawberryfields/apps/similarity.py	15.82% <0.00%> (-84.18%)	:arrow_down:
strawberryfields/io/blackbird_io.py	9.43% <0.00%> (-83.97%)	:arrow_down:
... and 38 more

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[thisac]

Closing due to being added in #714 and part of latest release (v0.23.0).