fix: persist Linked Verifiable Presentations for did:web

[nanderstabel]

Description of change

Issue

Previously, whenever UniCore was restarted, it generated a completely new DID Web Document from scratch. This behavior meant that any previously persisted changes to the document were overwritten, resulting in the loss of LinkedVerifiablePresentation services upon reboot.

Solution

This PR addresses the problem by checking whether a DID Web Document already exists before creating a new one. If an existing document is found, UniCore uses it, ensuring that all previously persisted changes—including LinkedVerifiablePresentation services—are retained across restarts.

Additional Changes

• Added a presentation_ids field to the Service aggregate. This enhancement makes it easier for implementers to keep track of which presentations are currently being linked.

Links to any relevant issues

n/a

How the change has been tested

1. Run UniCore in a docker container using the postgres event store type.
2. In order to set a Linked VP, see the steps in this PR
3. Check the /.well-known/did.json endpoint to validate that it contains a service of type LinkedVerifiablePresentation
4. Stop the container: docker compose stop
5. Restart the container docker compose start
6. Check the /.well-known/did.json endpoint again to validate that it still contains a service of type LinkedVerifiablePresentation

Definition of Done checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have successfully tested this change in a docker environment

[github-actions]

🎉 This PR is included in version 1.0.0-beta.7 🎉

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