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

swagger/definitions/request/agent/update_payload.yml

@@ -0,0 +1,18 @@
+type: object
+required:
+  - role
+properties:
+  role:
+    type: string
+    enum: ['agent', 'administrator']
+    description: Whether its administrator or agent
+    example: 'agent'
+  availability_status:
+    type: string
+    enum: ['available', 'busy', 'offline']
+    description: The availability status of the agent.
+    example: 'available'
+  auto_offline:
+    type: boolean
+    description: Whether the availability status of agent is configured to go offline automatically when away.
+    example: true