feat: visualize static operators and measurements as nodes

[andrijapau]

This PR adds basic visualization support for operators and measurement nodes in the DAG.

@qml.qjit(autograph=True, target="mlir")
@qml.qnode(dev)
def my_workflow(x):
    if x == 2:
        qml.X(0)
    elif x == 3:
        qml.Y(0)
    else:
        qml.Z(0)

    for i in range(3):
        qml.H(0)

    counter = 0 
    while counter < 5:
        qml.RX(0.5, 0)
   
    return qml.expval(qml.PauliZ(0)), qml.probs(), qml.var(qml.X(0)), qml.state()

[sc-104322]

[codecov]

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[mudit2812]

What about counts?

[mudit2812]

Personally, I don't really see why you're handling all the measurements in separate functions. Let me know if your agree, but they seem too similar to need different dispatches. I think a match-case might make more sense. I can totally be convinced otherwise though

[andrijapau]

What about counts?

Turns out Pietro's work didn't have support for counts 😬. Not sure why.