[Frontend] Add pytype-aval mapping and fix mlir-lowering

[erick-xanadu]

Context: More changes in the frontend for lowering

Description of the Change: Adds pytype to aval mapping for abstract quantum registers and qubits. Also fixes functions lowering abstract quantum registers and qubits to MLIR types.

Benefits: I can compile the following function to MLIR:

import catalyst

@catalyst.qjit(target="mlir")
def identity(x: catalyst.jax_primitives.AbstractQreg()):
    return x


print(identity.mlir)

• todo add test

To be merged after #1774