Adding tensor_comb feature to compute quantum sequences.

[vprusso]

Closes #831

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.9%. Comparing base (2087d8a) to head (f63bf52). Report is 182 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #832   +/-   ##
======================================
  Coverage    97.9%   97.9%           
======================================
  Files         167     168    +1     
  Lines        3278    3293   +15     
  Branches      718     721    +3     
======================================
+ Hits         3210    3225   +15     
  Misses         44      44           
  Partials       24      24           

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[purva-thakre]

Moving the corresponding issue to the next milestone. Given the deadline, I won't be able to review this in time.