Relevance Evaluator: Support Conversational Format in specs

Updated the dataMappingSchema to allow 'query' and 'response' to be either a string or an array of objects in Relevance Evaluator specs

Author: m7md7sien

assets/evaluators/builtin/relevance/spec.yaml

@@ -23,14 +23,22 @@ dataMappingSchema:
   type: "object"
   properties:
     query:
-      type: "string"
+      anyOf:
+        - type: "string"
+        - type: "array"
+          items:
+            type: "object"
     response:
-      type: "string"
+      anyOf:
+        - type: "string"
+        - type: "array"
+          items:
+            type: "object"
   required: ["query", "response"]
 outputSchema:
   relevance:
     type: "ordinal"
     desirable_direction: "increase"
     min_value: 1
     max_value: 5
-path: ./evaluator
+path: ./evaluator