Scope out MVP for template schema

I'd like to have a list of features and fields we want in the minimum viable product of a template schema. This should include all of the "obvious" fields we need based on our four test datasets (brown dwarfs, dwarf galaxies, tidal stream members, and exoplanet atmospheres). The idea is that we use these 4 use cases to decide and design the template tables. Once we have this, we then USE the template schema to implement the 3 new schemas.

**Tables from SIMPLE and Stellar Stream members (star-related):**
- [x] Rotational Parameters - vsini, rotation, inclination. https://github.com/astrodbtoolkit/astrodb-template-db/issues/126
- [ ] Dynamical Masses
- [x] Radial Velocities #69
- [x] Proper Motions 9cc247520726225ebb3ff2b3df42df56f09d0f78
- [x] Companion Relationships #36. includes on-sky separation.
- [x] Companion Parameters #116
- [x] Modeled Parameters - e.g., retrieved parameters, metallicity. #121
- [x] SourceTypes - could be spectral type, evolutionary state (giant, RRL, etc). #118
- [x] Associations - e.g., moving group, cluster, stream. Include membership_probability, adopted, reference. #113

**Tables from Dwarf Galaxies (galaxy-related):**

- [ ] redshift #194
- [x] ~~Galaxy/Source type (e.g., dSph, Irr)~~. Using generic SourceTypes #118

**Tables from Exoplanet Atmospheres (planet-related):**
- [ ] ~~TBD: molecular detections. E.g., water or CO _detection_ where equivalent width doesn't make sense.~~
- [ ] ~~Line strengths - E.g., H-alpha. Could be absorption or emission. equivalent width, doppler shift/redshift, observation type (e.g., transit, emission), SNR. (Raw measurement, model independent). "present" boolean for just detection reports? how to differentiate between absorption and emission?~~

**Reference tables:**

- [x] ParameterList - for ModeledParameters and CompanionParameters #116
- [ ] Observation types - transit, emission, reflected light, direct imaging
- [ ] Species - h-alpha, CO, H2O. Does this already exist?
- [x] SourceTypeList - dSph, Irr, #118
- [x] AssociationList - e.g., cluster or stream names.
- [x] CompanionList #116

**Archetypal Data to populate template with data (#87):**
- [x] brown dwarf - Gl 229B
- [ ] a planet
- [ ] a galaxy
- [x] a binary star system
- [ ] tidal stream member