Rediscuss file presentations incl. formalization of access modalities

[olinux]

I would like to rediscuss the way files are represented in openMINDS currently. The following aspects seem to be non-ideal:

• distinction of the location/access url and "file" since the same file could potentially have multiple locations
• properties in file representations which are usually not easily automatically acquired (such as "specialUsageRole", "contentDescription" etc.) should be extracted from the "file" entity to simplify automatic ingestion
• for access protected resources (this is also relevant e.g. for protected web services), we should find a way to formalize the authentication protocols required for such a file so automated pipelines have a chance to execute the proper steps for gathering a valid token and to properly authenticate.

[olinux]

Also in this aspect, we might want to think about how to deal with archives (ZIP / TARs) and/or the "FileArchive" schema

[lzehl]

related past issue (closed) #257

[apdavison]

I think #318 is also relevant. We probably need a brainstorming meeting to work through all of this.