Implement namespace service backend

[gabor-boros]

Summary

The version v0.1.0 requires all basic features to function. Although a big chunk of the backend functionalities are implemented, the namespace service and its related API endpoints are missing.

• Implement the namespace service
• Extend the Open API description and regenerate the HTTP server from it
• Add a new HTTP controller
• Implement the missing strict server interface methods
• Regenerate the front-end API client (using pnpm generate executed in the web directory)

Example Use-cases

See the v0.1.0 milestone.

Drawbacks

N/A