DM-53837: Replace column definitions in DRP schemas with references to a base schema

[JeremyMcCormick]

This PR converts lsstcam.yaml, imsim.yaml, and hsc.yaml to use shared column references from a new schema drp_base.yaml, which functions as a column dictionary. The new schema was created from the current contents of lsstcam.yaml, plus some detection flags present in imsim.yaml and hsc.yaml.

The columns in drp_base.yaml were sorted alphabetically using felis dump --sort-columns. The drp_base.yaml contains only the table and column definitions without any constraints, primary keys, etc.

Checklist

When making changes to YAML files in the schemas directory:

• If applicable, incremented the schema version number, following the guidelines in the contribution guide
• Referred to the documentation on specific schemas for additional versioning information, change constraints, or tasks that may need to be performed, based on which schema is being updated
• Ran Jenkins
• Added a news fragment describing the changes

[JeremyMcCormick]

@gpdf As discussed, I've also added the detection flags, e.g., detect_isPrimary, etc., to the base schema. This also included the flag fields merge_peak_sky and sky_object.

I also changed a few instances of fits:tunit to ivoa:unit in hsc.yaml and imsim.yaml.

[gpdf]

Please fix "LSSTComCam" in the Visit table description for lsstcam.yaml

[gpdf]

Looks good; go for it