* Introduce RepositoryCoordinates
RepositoryCoordinates will be used for the enrichment of the embedded repositories of search result hits. This is required, because if we used the normal repository for the enrichment, we would get a lot of unrelated enrichers would be applied.
* Add builder method to HalEnricherContext
With the new builder method it is possible to add an object to the context with an interface as key.
* Add enricher support for embedded repository by applying enricher for RepositoryCoordinates
* Use embedded repository for avatars
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