Don't include constrained bonds / angles from OpenFF #116
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Description
Currently all bonds and angles that are assigned parameters are converted into interactions to compute by the OpenFF converter, even if some bonds / angles are constrained by distance constraints.
This PR aligns more closely with how OpenFF Interchange exports to OpenMM, such that constrained bonds, and angles where all atoms are constrained (e.g. water), no longer contribute to the energy
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