Add agent around logo in Image 3

[jpstroop]

For consistency w/ Prezi

https://preview.iiif.io/api/image-prezi-rc2/api/presentation/3.0/#provider

[azaroth42]

This is a normative change, but one that would be painful if we didn't do.

[azaroth42]

Propose that we use this as the easy introduction / test case for the TRC process. The change is (one hopes) entirely uncontroversial.

[zimeon]

Issue approved by TRC vote

[tomcrane]

This TRC issue approved provider for the Presentation API:
IIIF/trc#7
(Provider property/Agent with logo, homepage, etc.)

And this TRC issue approved multiple logo images in Image and Presentation:
IIIF/trc#3

So, I can make a PR that has providers in both APIs, with multiple logos premitted.

But do we have approval for adding the whole provider structure to the Image API?
https://preview.iiif.io/api/image-prezi-rc2/api/presentation/3.0/#provider

[azaroth42]

I think the opposite is true. It's fine for Presentation, but we should be removing logo and requiredStatement/attribution from Image, per discussions.

We asked on two calls now, plus an email to -discuss and no one has spoken up in favor of keeping it.

I'll make an issue now that we're at that stage!

[tomcrane]

So, the immediate action is then to allow multiple logos in Prezi, to reflect IIIF/trc#3, and leave logo in Image (which is already [ .. ] in RC2) until a decision on #1787, which will need TRC approval.

I'll do the former now.

[azaroth42]

Superceded by #1787. Now invalid.