Initial commit of monkey patch demo notebook.

[gsalton]

Initial commit of monkey patch demo notebook. Added comparison with existing as_unitary() method and moved monkey patch intro to appendix, as discussed.

[review-notebook-app[bot]]

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[ajberdy]

Thanks for the contribution! If there are key gaps in the SDK circuit class, please raise these as feature requests and we will prioritize integrating them natively into the SDK.