Interfaces support for MIDs

[PaulLeCam]

Ensures MIDs can't be created using an interface as model metadata and relations can point to interface models.
Should also fix https://linear.app/3boxlabs/issue/CAT-2810/relations-can-be-optional-but-are-expected-to-be-required as part of the updated logic.

[linear]

CAT-2810 Relations Can Be Optional But Are Expected to Be Required

Description

https://discord.com/channels/682786569857662976/1151881548862345276/1162327586890850314

 claimID: StreamID documentReference(model: "Claim")

Error: HTTP request to 'http://localhost:7007/api/v0/streams' failed with status 'Internal Server Error': {"error":"Error while parsing relation from field claimID: Invalid StreamID: Error: Unable to decode multibase string \"undefined\", base36 decoder only supports inputs prefixed with k"}

Technical Information

https://github.com/ceramicnetwork/js-ceramic/blob/develop/packages/stream-model-instance-handler/src/model-instance-document-handler.ts#L233

StreamID for relations is expected to be present.

CAT-2788 Update MID creation logic

Ensure MIDs can't be created on interface models