genesets route for local server (#2079)

* first cut at GET /genesets route

* update existing tests to match code changes

* more GET /genesets and initial tests

* add missing test fixture

* geneset validation accepts OTA format

* genesets route: better error handling, more tests

* lint

local_server/default_config.py

@@ -63,10 +63,13 @@ dataset:
     type: local_file_csv
     local_file_csv:
       directory: null
-      file: null
+      file: null            # annotations file name
+      genesets_file: null   # gene sets file name
     ontology:
       enable: false
       obo_location: null
+    genesets:
+      readonly: false      # genesets CRUD enabled/disabled
 
   embeddings:
     names : []