Add a property flag in kraus_op
to identify whether it is a 'scaled' unitary matrix
#2085
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Description
Kraus operators can be categorized into (1) probabilistic unitary application (e.g., depolarizing) or (2) non-unitary matrix application (e.g., amplitude damping).
This PR adds a property flag and a utility function to categorize Kraus operators. Also, added a unit test to verify the correctness of the check.