Enable notes/descriptions for individual files

[eporter23]

Is your feature request related to new functionality not yet included in the product? Please describe.
When attaching files to a work, it can be helpful to provide a note or description for an individual file

Is your feature request related to a problem or a change to existing functionality? Please describe.
A clear and concise description of what the problem is. Ex. It is very difficult to [...] because [...]

Describe the solution you'd like
A clear and concise description of what you want to happen.

• Add one or more additional metadata fields to FileSets such as Note, Description
• Enable these metadata fields for display within Curate
• If a Description is provided, use this as alt text for the file in Curate and Lux if feasible

Describe alternatives you've considered
A clear and concise description of any alternative solutions or workarounds you've considered.

How will this impact users?
A clear and concise description of how many and which types of users would benefit from this feature, or any who may be negatively impacted by the change.

• Library staff depositors creating complex objects can benefit from providing additional context to a FileSet for its preservation purpose (e.g. notes about its digitization)
• End users can benefit from seeing a brief description of the fileset, such as a description of an image or audiovisual resource
• The repository's overall accessibility will be enhanced for all users interacting with non-textual material

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

• This feature will need wireframes to determine how descriptive fields can be displayed for individual files.
• IIIF reference on Annotations
• IIIF cookbook recipe for full-canvas annotation for a caption/note about an image
• Examples of Annotations in use: 1 | 2
• IIIF reference on Transcripts/captions
• Samvera VirtualConnect presentation on alt text