Moves partial calculation into CSM and ISIS observation classes. (#4436)

* Remove duplicated member variables and accesor functions from BundleObservation and add Csm camera type to Camera enum

* Remove commented-out code

* Imagecoeff migrated into BundleObservation class working

* Get base level working for all coeffs in ISIS

* Fix accidental move into if statement to get tests passing again

* Updated RHS for CsmBundleObservation to work

* Adds point3D support to CSM Camera observations and also adds ground Partials member function to CSMCamera

* Draft of sensor partials code

* Add docs, some fixes based on review requests

* move computation of weights and observation values to bundle observations

* Add observationvalue function to CsmBundleObservation and move the weighting that it is possible to to the observation classes

* Make CSMSolveSet an optional parameter to get jigsaw tests passing again

* cleanup

* Move observation weights into MLE if block

Co-authored-by: Kristin Berry <kberry@gyro.wr.usgs.gov>