docs: update rust cloud tmq sample code (#16409)

docs/en/09-data-out/_sub_rust.mdx

 ```rust
-{{#include docs/examples/rust/nativeexample/examples/subscribe_demo.rs}}
+{{#include docs/examples/rust/cloud-example/examples/subscribe_demo.rs}}
 ```

docs/examples/rust/cloud-example/examples/subscribe_demo.rs

+use std::time::Duration;
+
+use chrono::{DateTime, Local};
+use taos::*;
+
+// Query options 2, use deserialization with serde.
+#[derive(Debug, serde::Deserialize)]
+#[allow(dead_code)]
+struct Record {
+    // deserialize timestamp to chrono::DateTime<Local>
+    ts: DateTime<Local>,
+    // float to f32
+    current: Option<f32>,
+    // int to i32
+    voltage: Option<i32>,
+    phase: Option<f32>,
+}
+
+async fn prepare(taos: Taos) -> anyhow::Result<()> {
+    let inserted = taos.exec_many([
+        // create child table
+        "CREATE TABLE `d0` USING `meters` TAGS(0, 'Los Angles')",
+        // insert into child table
+        "INSERT INTO `d0` values(now - 10s, 10, 116, 0.32)",
+        // insert with NULL values
+        "INSERT INTO `d0` values(now - 8s, NULL, NULL, NULL)",
+        // insert and automatically create table with tags if not exists
+        "INSERT INTO `d1` USING `meters` TAGS(1, 'San Francisco') values(now - 9s, 10.1, 119, 0.33)",
+        // insert many records in a single sql
+        "INSERT INTO `d1` values (now-8s, 10, 120, 0.33) (now - 6s, 10, 119, 0.34) (now - 4s, 11.2, 118, 0.322)",
+    ]).await?;
+    assert_eq!(inserted, 6);
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let dsn = "taosws://localhost:6030";
+    let builder = TaosBuilder::from_dsn(dsn)?;
+
+    let taos = builder.build()?;
+    let db = "tmq";
+
+    // prepare database
+    taos.exec_many([
+        format!("DROP TOPIC IF EXISTS tmq_meters"),
+        format!("DROP DATABASE IF EXISTS `{db}`"),
+        format!("CREATE DATABASE `{db}`"),
+        format!("USE `{db}`"),
+        // create super table
+        format!("CREATE TABLE `meters` (`ts` TIMESTAMP, `current` FLOAT, `voltage` INT, `phase` FLOAT) TAGS (`groupid` INT, `location` BINARY(16))"),
+        // create topic for subscription
+        format!("CREATE TOPIC tmq_meters with META AS DATABASE {db}")
+    ])
+    .await?;
+
+    let task = tokio::spawn(prepare(taos));
+
+    tokio::time::sleep(Duration::from_secs(1)).await;
+
+    // subscribe
+    let tmq = TmqBuilder::from_dsn("taosws://localhost:6030/?group.id=test")?;
+
+    let mut consumer = tmq.build()?;
+    consumer.subscribe(["tmq_meters"]).await?;
+
+    {
+        let mut stream = consumer.stream();
+
+        while let Some((offset, message)) = stream.try_next().await? {
+            // get information from offset
+
+            // the topic
+            let topic = offset.topic();
+            // the vgroup id, like partition id in kafka.
+            let vgroup_id = offset.vgroup_id();
+            println!("* in vgroup id {vgroup_id} of topic {topic}\n");
+
+            if let Some(data) = message.into_data() {
+                while let Some(block) = data.fetch_raw_block().await? {
+                    // one block for one table, get table name if needed
+                    let name = block.table_name();
+                    let records: Vec<Record> = block.deserialize().try_collect()?;
+                    println!(
+                        "** table: {}, got {} records: {:#?}\n",
+                        name.unwrap(),
+                        records.len(),
+                        records
+                    );
+                }
+            }
+            consumer.commit(offset).await?;
+        }
+    }
+
+    consumer.unsubscribe().await;
+
+    task.await??;
+
+    Ok(())
+}