Refactor TestOrbit

[moeyensj]

This PR adds a new TestOrbit class that has a function range_observations which takes a qv.Linkage[PointSourceDetections, Exposures] and will return a RangedPointSourceDetections table with rho values populated with the topocentric distance to each detection if they were to lie at the same distance from the Sun as the test orbit.

Note: this PR currently relies on the following to be merged in adam_core:

• Add the aberrated orbit to the Ephemeris table B612-Asteroid-Institute/adam_core#53
• Add unit tests for rotations between frames B612-Asteroid-Institute/adam_core#49

I have drafted a few unit tests and will add them.

@spenczar, if you want to take a look now as an initial design review that would be sweet.

[spenczar]

No immediate concerns. I want a little bit of time to think about this but I like the way it is looking. The RangedPointSourceDetections table is a wonderful and simple way to handle this.

[spenczar]

self.object_id should be set to None so it isnt undefined