Best representation for tag / key value annotations in search ResultItem

Current situation: Both tags and key-value OMERO image annotations are represented as keywords. According to the first Hub Health group feedback, this might be confusing for the end-user and avert them from using the interface (see the screenshot for the clarification)

Requirements:

• Need for OMERO image items: represent unstructured annotations (child of #106)
  • unstructured: representing them as fields of the record won't do
• Need to weigh the annotations in on search (indexer-related, currently keywords are more important for search than just the record text)
• Think about user perspective and make the representation not confusing

Problems:

• keywords are split on ","
• annotations have different formats (Tag, Key-Value), which are not well representable in the Keyword section
• keyword filters are automatically produced by concatenating all annotations, which is wrong