Core: Define de-enrichers as counter-parts to enrichers

Extension Warp handles de-enrichment by watching changes in enriched fields.

But the implementation of de-enrichment could be specifically addressed for enricher implementations, thus being part of the Core.

Additionally, enrichers might know how to unwrap the value so it can be serialized and transferred to client (this might be separate issue).

@Unwrap @Inject
Bean bean;