Add dsl for outcome schemas (tables) for roqua

lib/quby/compiler/outputs/roqua_serializer.rb

@@ -21,7 +21,7 @@ module Quby
             respondent_types: questionnaire.respondent_types,
             tags: questionnaire.tags.to_h.keys,
             charts: charts,
-            outcome_schema: outcome_schema,
+            outcome_tables_schema: outcome_tables_schema,
           }
         end
 
@@ -75,7 +75,7 @@ module Quby
           }
         end
 
-        def outcome_schema
+        def outcome_tables_schema
           # hash of tables, with the score keys (rows) and subscore keys (columns) used for each
           tables = Hash.new{ |hash, key| hash[key] = {score_keys: [], subscore_keys: []} }
           # hash of `subscore_key: subscore_label` pairs used in tables