Added FermionicSwap chemistry sample

[tobiashaggepnnl]

A C# library to construct descriptions of swap-networked Trotter steps for two-site Hamiltonians, a companion Q# library to evaluate Trotter steps based on constructed descriptions, and a modified version of the SimulateHubbardHamiltonian sample which evaluates its Trotter steps using swap networks. Unit tests for the two libraries. The code attempts to follow QDK's existing framework for Hamiltonian evolution.

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