GalSim

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Rebekah Hounsell wants to use GalSim to simulate prism observations from Roman. This mostly involves implementing an old (and closed because part of it was done) issue of 1-d degenerate objects. In this case, the 1-d function would be the SED in the direction of the prism dispersion.

Working on this with SN PIT. First prototype prism model implemented as photon op in https://github.com/matroxel/roman_imsim/blob/prism/roman_imsim/photonOps.py

Need to update some roman module things to enable prism elements that we had previously never implemented, which will happen in this branch.