Input common patterns as ZX diagrams via text input

[boldar99]

See also #178

• [ ] sums of Pauli strings (ZXW diagram)
• [ ] sequence of Pauli/phase gadgets
• [ ] a parity matrix
• [ ] a set of stabilisers of a stabiliser state
• [ ] a graph state

[boldar99]

Or potentially, sequences of Pauli gadgets

[jvdwetering]

Taking this more general, there a couple of data structures that you would want to easily write as a ZX-diagram: a parity matrix, a set of stabilisers of a stabiliser state, a graph state. I wonder if there is some neat way we could organise these different types of inputs.