Consistently handle Metadata_Well and Metadata_Plate column renaming and join specification

[d33bs]

I noticed Metadata_Well and Metadata_Plate are sometimes handled differently within the preset identifying columns and joins along with column renaming logic found within cytotable.convert._prepend_column_name. This can result in tables which include, for example, columns named Metadata_Well and Image_Metadata_Plate. Creating this issue to better clarify how these columns should be named.

Should Metadata labeled columns ever have a table name prefix? For example, is Image_Metadata_Well an accurate depiction of Metadata_Well (as a metadata column from the image table)?