TextualBody identifiers

[stephenwf]

Currently the id property inside of a TextualBody annotation prevent Manifests from being validated. It is valid to have an identifier, but it is not required - so the Manifest Editor could still remove it when serialising the P3 resource.

The relevant code is here:
https://github.com/IIIF-Commons/parser/blob/main/src/presentation-3/serialize-presentation-3.ts#L17-L18

Where we do remove the ID if it was generated internally entity.id?.startsWith('vault://') - so when creating an HTML Body:

https://github.com/digirati-co-uk/iiif-manifest-editor/blob/main/packages/creators/src/ContentResource/HTMLBodyCreator/create-html-body.tsx#L15

We should make sure the ID is prefixed with vault:// if we want to ensure it's removed.