Synonyms for EDAM terms

[fbacall]

Summary of changes

• Index content by EDAM topic/operation synonyms as well as their exact names.
• Allow content to be queried by EDAM topic/operation (instead of just filtering).

Motivation and context

https://docs.google.com/document/d/1Qt6ABVqkDRTulg6ZhLsKu8YYlGbvD-xQvQGoVHuUwow/edit
@bianchini88

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.