AutoGraph does not transform the body of `qml.prod`

[dime10]

The following code fails to be converted by autograph, even with #1910. The reason is that prod is not explicitly listed in the transform call hotfix nor the transform object hotfix.

@qml.prod
def template(b):
    if b:
        qml.H(0)
        qml.X(0)

@qjit(autograph=True)
@qml.qnode(qml.device("null.qubit", wires=0))
def circuit(b: bool):
    qml.adjoint(template(b))
    return qml.state()

  File "test.py", line 12, in template
    if b:

jax.errors.TracerBoolConversionError: Attempted boolean conversion of traced array with shape bool[].
This concrete value was not available in Python because it depends on the value of the argument b.

---

Note that there are likely other decorators similar to qml.prod that we haven't explicitly enabled for passthrough. It might be useful to generalize the CatalystCallable strategy in PennyLane.

[dime10]

Tagging @PennyLaneAI/core for visibility regarding autograph work in PennyLane / for the unification.