Deprecate Similar Fields on Collection and Field

[NevilleS]

From fideslang created by pattisdr: IABTechLab#149

Is your feature request related to a specific problem?

We just deprecated data_qualifier, joint_controller, retention, and third_country_transfers from Dataset. https://github.com/ethyca/fideslang/pull/146. The idea being that these more "legal" type fields don't belong on the data engineering construct: "dataset". Similarly, we have data_qualifier and retention on DatasetCollections and on DatasetFields. I assume these fields should be deprecated similarly in a follow-up @rsilvery

Describe the solution you'd like

Deprecate data qualifier and retention fields from DatasetCollection and DatasetField in fideslang.

I believe that data qualifier (identifiability) for both collection and dataset are also exposed in the UI.

Describe alternatives you've considered, if any

A description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.