Support for OAuth authentication for connecting to Subscribed Catalogues, and federation fixes

[joe-crawford]

Support for OAuth authentication for Subscribed Catalogue connections (resolves mc-9890):

• A subscribedCatalogueAuthenticationType must be supplied as well as a subscribedCatalogueType. Supported authentication types are No Authentication, API Key, and OAuth (Client Credentials/Server-to-Server).
• Update controller and services to allow multiple authentication types and add migration script.

Support for federating VersionedFolders and importer changes:

• Allow VersionedFolder importers to be used in federation.
• Allow passing an authority to importers to be used if saving imported domains.
• Add optional canFederate method to ImporterProviderService - defaults to true, if false the importer cannot be used in federation.
• VersionedFolderService versioning methods updates and fixes.

Atom feed changes:

• Support federating version links from Atom subscribed catalogues by looking at like labels with different lastUpdated times.
• Add model versions to contentItemVersion extension to published Atom feed, update XSDs.

Published models changes:

• Use modelVersionTag field to hold contentItemVersion from Atom feed catalogues.

Update tests:

• Replace (disabled) admin API key with read-only API key in tests using Continuous Deployment instance.

[joe-crawford]

Failing test looks unrelated.

Example requests are in the Federation - PR 388 folder in the Postman collection.

[jamesrwelch]

This is an epic piece of work - thank you! You demoed the functionality and talked me through the code changes. The tests pass and I can't see any obvious issues with the code itself, so I think this is good to go. Nice one!

[joe-crawford]

Great, thank you!