Codegen parameter for query json serialization (#21718)

* Add endpoints with query parameters that require Json-serialization

* Add property for query json-serialization

* Update samples

* Adjust indentation for specification

samples/client/echo_api/java/feign-gson/api/openapi.yaml

@@ -467,6 +467,39 @@ paths:
       - query
       x-accepts:
       - text/plain
+  /query/style_jsonSerialization/object:
+    get:
+      description: Test query parameter(s)
+      operationId: test/query/style_jsonSerialization/object
+      parameters:
+      - content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/Pet"
+        in: query
+        name: json_serialized_object_ref_string_query
+        required: false
+      - content:
+          application/json:
+            schema:
+              items:
+                $ref: "#/components/schemas/Pet"
+              type: array
+        in: query
+        name: json_serialized_object_array_ref_string_query
+        required: false
+      responses:
+        "200":
+          content:
+            text/plain:
+              schema:
+                type: string
+          description: Successful operation
+      summary: Test query parameter(s)
+      tags:
+      - query
+      x-accepts:
+      - text/plain
   /body/application/octetstream/binary:
     post:
       description: Test body parameter(s)