Layering circuit class with unit gate set

[masa10-f]

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Graphix now treats all the gates equally and doesn't have a unit gate set so we need transpilation recipes for the all.

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Express every gate as a combination of J and CZ, a well known unit gate set in XY-limited MBQC. This will make it easier for us to maintain circuit class and tranpilation recipes, which converts circuits into patterns or underlying graph states.

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I found that we can also include the YZ gadget as a unit gate because it can be treated as a multi-qubit unitary gate, and it has an obvious gflow. g(i) = {i} always holds, where i is a qubit measured in YZ plane

[mgarnier59]

Since this is linked to the transpiler, maybe discuss on https://github.com/TeamGraphix/graphix/issues/142 ?

[masa10-f]

Thanks! I intend to refactor the circuit class both for direct pattern transpilation and graph state generation, which I am preparing I have already done this in another repo., so we can discuss on the coming PR