Collection improvements v2

[stephenwf]

• Fixes bug with missing navPlace when serialising
• Default "provider" label is now {"none": [""]} instead of {"none": ["Unknown"]}
• Fixed @context value for Manifests/Collections with navPlace extension
• Added non-standard first, next, prev and total properties to Collections when upgrading to allow tools to use upgraded Collections in code - adding since its confirmed these properties are returning in v4.0. (I've called this "3.1" in the code).
• Updated cookbook recipe tests, all passing.

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[mathewjordan]

@stephenwf Thank you for bringing in the collections page support early. This will help a lot!

[stephenwf]

No problem! I thought I'd get it done while the conference was still fresh!

I'm working on an extension of Vault to support loading too.
IIIF-Commons/iiif-helpers#25

Which has brought out a few details. Such as this:
https://iiif.harvardartmuseums.org/collections/top

When you load a page the ID is the same for every page (it doesn't include ?page= in the ID). Just in case you run into the same issue.

Also it's really tricky to get a "page size" and not all collections out there have a "total" field, so pagination is mostly limited to a "next" if you're loading hosted collections.

Also a build of Theseus here too trying to shake out any potential issues.
https://feature-paginated-collection.theseus-viewer.pages.dev/?iiif-content=https%3A%2F%2Fapi.digitale-sammlungen.de%2Fiiif%2Fpresentation%2Fv2%2Fcollection%2Ftop&collection=https%3A%2F%2Fapi.digitale-sammlungen.de%2Fiiif%2Fpresentation%2Fv2%2Fcollection%2Ftop