Add Flag to avoid copying state vector

[jkalsi1]

resolves #8041

[jkalsi1]

@sergeisakov @mhucka , here is a first go at implementing my proposed temporary solution to #8041 in Cirq, and #893 in qsim.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.63%. Comparing base (89993a9) to head (e86f0bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8054   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files        1110     1110           
  Lines       99795    99850   +55     
=======================================
+ Hits        99434    99489   +55     
  Misses        361      361           

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