Hook Columns not passed to FastAPI Response

[frayle-ons]

If additional, optional data is added into a dataclass object through a hook - i.e. adding an extra column of data - then the current functionality does not pass this added data to the fastapi response objects even though the dataclass object does return the extra data correctly.

This is due to the convert_dataframe_to_pydantic_response() functions only extracting data from the dataclass objects that is either required or specified as vdb metadata. We wish to add functionality that also moves each row's added columns to the fastapi response when added via hooks.