"Patch Annotation" would be a useful option

[ceesem]

The current implementation of update_annotation requires a complete annotation to be posted, including all original info as well as the annotation id. Typically, one one wants to update a small portion of the data, and it would be nice if there were a patch_annotation endpoint that took annotation ids and only the data that the user wanted to change, leaving any unspecified fields with their existing values.

Alternatively, since the current behavior would be identical if the user supplied a complete annotation, the current update behavior could expand to update only those fields provided without breaking anything.

[dlbrittain]

This will be addressed with this PR:
CAVEconnectome/DynamicAnnotationDB#47