feat: Update swagger to openapi 3.0.4, update request payloads with examples (#11374)

swagger/paths/application/custom_attributes/index.yml

@@ -3,22 +3,29 @@ tags:
 operationId: get-account-custom-attribute
 summary: List all custom attributes in an account
 parameters:
-    - name: attribute_model
-      in: query
+  - name: attribute_model
+    in: query
+    schema:
       type: string
       enum: ['0', '1']
-      description: conversation_attribute(0)/contact_attribute(1)
-      required: true
+    description: conversation_attribute(0)/contact_attribute(1)
+    required: true
 description: Get details of custom attributes in an Account
 security:
   - userApiKey: []
 responses:
-  200:
+  '200':
     description: Success
-    schema:
-        type: array
-        description: 'Array of all custom attributes'
-        items:
-          $ref: '#/definitions/custom_attribute'
-  403:
+    content:
+      application/json:
+        schema:
+          type: array
+          description: 'Array of all custom attributes'
+          items:
+            $ref: '#/components/schemas/custom_attribute'
+  '403':
     description: Access denied
+    content:
+      application/json:
+        schema:
+          $ref: '#/components/schemas/bad_request_error'