Symm cons keywords

[philipp-q]

This PR addresses an issue, that appears when using the symmetry_conserving_bravyi_kitaev transformation on operators acting only on a subset of qubits of the whole Hamiltonian (e.g. when one wants to determine the entries of the 2-RDM). This may not be very useful on certain systems (e.g. 2 fermions, 4 orbitals), as the transformation does not yield any benefit, but allows broader application.

Fixed by simple addition of 2 keywords in src/openfermion/transforms/opconversions/remove_symmetry_qubits.py + added a test with a dummy operator.

(A similar issue appears with the BKSF transformation, but would require deeper changes)

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[philipp-q]

@googlebot I signed it!

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[philipp-q]

@googlebot I fixed it.