Type the /search API response to better document the response schema

- Both Text, Image Search were already giving list of entry, score
- This change just concretizes this change and exposes this in the API
  documentation (i.e OpenAPI, Swagger, Redocs)

src/utils/rawconfig.py

@@ -71,3 +71,8 @@ class FullConfig(ConfigBase):
     content_type: Optional[ContentConfig]
     search_type: Optional[SearchConfig]
     processor: Optional[ProcessorConfig]
+
+class SearchResponse(ConfigBase):
+    entry: str
+    score: str
+    additional: Optional[dict]