Add an operator based unit test

[adekusar-drl]

What is the expected enhancement?

Add a unit test that validates the output of the algorithm by comparing the original matrix of a circuit and the matrix of the transpiled circuit.
Pseudo code of the test

qc = QuantumCircuit(10)
qc.mcx(range(8), 9)

tqc = transpile(qc)

# apply qubit permutations based on layouts of the transpiled circuit
# .....

np.assert_almost_equal(Operator(qc).data, Operator(tqc).data)