Generalize the constructor of QuantumObject

[ytdHuang]

fix #46

Also add tests for expected errors in generating QuantumObjects.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.00%. Comparing base (93687f8) to head (31efcf8).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   89.74%   90.00%   +0.25%     
==========================================
  Files          17       18       +1     
  Lines        1619     1661      +42     
==========================================
+ Hits         1453     1495      +42     
  Misses        166      166              

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[albertomercurio]

Thanks! That's a better implementation for sure. I'm a bit unsure if in the future we might need tensors instead of just vectors and matrices. But for the moment this is very fine.