Add ability for Transformers configuration to override (currently) mandated metadata file parameter

[Chris-Schnaufer]

Task to do Allow Transformers to determine if metadata files are required

Reason There are 'helper' Transformers that don't need metadata. For example, loading CSV files into BETYdb

Result Transformers no longer must have metadata - specialized override/handling of this requirement is no longer needed

Steps to take

• [x] Add an option to Transformer configuration allowing the metadata requirement to be removed at runtime
• [x] Change the coordination code to allow suppression of metadata parameter & requirement
• [ ] Update transformers as needed to use new suppression feature
• [ ] Release new transformer docker containers

[Chris-Schnaufer]

Need to write tickets for the rest of transformers needing changes as a result of top two check marks in original writeup