Adding browse type to product type mapping to config schema

preprocessor/preprocessor/config-schema.yaml

@@ -68,6 +68,10 @@ properties:
           description: A mapping of product type -> steps configuration
           $ref: '#/definitions/steps'
     required: [types]
+
+  browse_type_mapping:
+    description: Mapping of browse types to product types. Default is direct mapping.
+    type: object
 required:
   - source
   - target