Add support for output filter chain on listener

- add demo for pii redaction

crates/brightstaff/src/handlers/integration_tests.rs

@@ -76,6 +76,7 @@ mod tests {
             name: "test-listener".to_string(),
             agents: Some(vec![agent_pipeline.clone()]),
             filter_chain: None,
+            output_filter_chain: None,
             port: 8080,
             router: None,
         };