Add unambiguous discrimination strategy to state distinguishability and state exclusion

[vprusso]

Enable the ability for the user to unambiguously exclude or discriminate amongst of quantum states in the state_distinguishability.py and state_exclusion.py files, respectively.

Refer to Section 2.4 in arXiv:1707.02571 for further information on the constraints and definition of the unambiguous case for the SDP and refer to ppt_distinguishability.py for an example of how the unambiguous strategy is supported within the SDP and function arguments.