Reworking how ingest_spectrum works using the ORM

[dr-rodriguez]

First pass at reworking how ingest_spectrum works using the ORM

Separate PR from kelle#4 to either merge separately and/or have the automated tests run.

[kelle]

return a dictionary called flags.

• "added": True if it's added and False if it's skipped.
• "content": the data that was attempted to add
• "message": string which includes information about why skipped

[dr-rodriguez]

I've added the return of flags and significantly cleaned up the tests.
However, I just realized that things like telescope, instrument, and mode used to be checked so we should update the validation to ensure they are present.

[kelle]

Some minor comments. Feel free to merge if you don't have time to implement them.