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/test/fixtures/dataset_config_outline.py

@@ -16,9 +16,12 @@ dataset:
     local_file_csv:
       directory: {local_file_csv_directory}
       file: {local_file_csv_file}
+      genesets_file: {local_file_csv_genesets_file}
     ontology:
       enable: {ontology_enabled}
       obo_location: {obo_location}
+    genesets:
+      readonly: {genesets_readonly}
 
   embeddings:
     names: {embedding_names}