feat(flow): add flow statistics and SHOW FLOW STATUS (release slice)

Signed-off-by: discord9 <discord9@163.com>
(cherry picked from commit 523c60c53bdc21fd1b1fa43b857e78de710f0d58)

src/cli/src/metadata/control/put/key.rs

@@ -345,9 +345,7 @@ mod tests {
 
     #[test]
     fn test_validate_exact_flow_state_key() {
-        let value = FlowStateValue::new(BTreeMap::new(), BTreeMap::new())
-            .try_as_raw_value()
-            .unwrap();
+        let value = FlowStateValue::default().try_as_raw_value().unwrap();
 
         validate_metadata_value(&flow_state_full_key(), &value).unwrap();
     }