Add expectation value tests for Python extensions

[Todorbsc]

In order to test whether the conversion of a Python module circuit into Tenet is working properly, i.e. the results in Python and Tenet match, we should implement tests similar to YaoBlocks tests where we would compare the results obtained by the Python library and the Tenet contraction.
In YaoBlocks, this was NOT working due to a wrong order of the Sites, which was resolved in this PR.
This bug potentially exists in Qiskit.jl and Qibo.jl, where the dual sites are in first place. However, in Cirq.jl and Quimb.jl the dual sites are in second place.