add openqasm support to Circuit

[rezah]

A simple attepmt to include open_qasm to Circuit class

[codecov[bot]]

Codecov Report

Merging #138 (b1da185) into develop (335b1d6) will decrease coverage by 40.33%. The diff coverage is 5.63%.

@@             Coverage Diff              @@
##           develop     #138       +/-   ##
============================================
- Coverage    79.06%   38.73%   -40.34%     
============================================
  Files           40       40               
  Lines        15657    15721       +64     
============================================
- Hits         12379     6089     -6290     
- Misses        3278     9632     +6354     

Impacted Files	Coverage Δ
quimb/tensor/tensor_core.py	29.12% <ø> (-40.90%)	:arrow_down:
quimb/tensor/circuit.py	24.17% <5.63%> (-57.80%)	:arrow_down:
quimb/tensor/geometry.py	7.87% <0.00%> (-90.31%)	:arrow_down:
quimb/tensor/circuit_gen.py	12.94% <0.00%> (-87.06%)	:arrow_down:
quimb/tensor/tensor_dmrg.py	13.30% <0.00%> (-79.40%)	:arrow_down:
quimb/tensor/tensor_1d_tebd.py	13.39% <0.00%> (-76.56%)	:arrow_down:
quimb/tensor/tensor_approx_spectral.py	15.15% <0.00%> (-72.73%)	:arrow_down:
quimb/tensor/tensor_2d.py	14.60% <0.00%> (-70.39%)	:arrow_down:
quimb/tensor/tensor_2d_tebd.py	15.14% <0.00%> (-66.58%)	:arrow_down:
quimb/tensor/drawing.py	5.91% <0.00%> (-62.93%)	:arrow_down:
... and 20 more

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[jcmgray]

I ended adapting this to a openqasm parser here: https://github.com/jcmgray/quimb/commit/7ed075fae1aee68c6d16cd08c635d1af4e0f897e, so closing in favor of that, but thanks for the PR anyhow Reza!