feature: Persist circuits and tasks in batch execute

[rmshaffer]

Issue #, if available:
#255

Description of changes:
Starting with the changes from #260 and performing the additional work required to merge to main.

In particular, we need to:

• rework the duplication of circuit and circuits - see comment thread here.

Testing done:
tox

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7cfecb8) to head (03fe023).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #270   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines         1211      1243   +32     
  Branches       295       306   +11     
=========================================
+ Hits          1211      1243   +32     

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[yitchen-tim]

circuit is not compatible to batch_execute(). circuits is more general, when using execute() instead of batch_execute() , circuits can just return a list with one circuit. Going down this route, we can have circuit and circuits coexist, but put circuit on a deprecation path.