add query_encoder to fernignore

Author: jsklan

.fernignore

@@ -7,4 +7,7 @@ LICENSE.md
 .github/workflows/semgrep.yml
 
 # Files that avoid breaking changes due to renames.
-src/merge/resources/accounting/types/currency_enum.py
+src/merge/resources/accounting/types/currency_enum.py
+
+# File that encodes enum query params as comma separated lists by default
+src/merge/core/query_encoder.py