feat: add cls sse example

[ianhu92]

测试脚本：

cat examples/cls/v20201016/run.sh
#!/bin/bash
set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(cd "$SCRIPT_DIR/../../.." && pwd)"
BUILD_DIR=/tmp/cls-build

DEPS=\
$HOME/.m2/repository/commons-logging/commons-logging/1.2/commons-logging-1.2.jar:\
$HOME/.m2/repository/com/squareup/okio/okio/1.15.0/okio-1.15.0.jar:\
$HOME/.m2/repository/com/squareup/okhttp3/okhttp/3.12.13/okhttp-3.12.13.jar:\
$HOME/.m2/repository/com/squareup/okhttp3/logging-interceptor/3.12.13/logging-interceptor-3.12.13.jar:\
$HOME/.m2/repository/com/google/code/gson/gson/2.8.9/gson-2.8.9.jar:\
$HOME/.m2/repository/org/ini4j/ini4j/0.5.4/ini4j-0.5.4.jar

echo "==> 编译 SDK..."
mkdir -p "$BUILD_DIR"
find "$PROJECT_DIR/src/main/java" -name "*.java" > /tmp/sdk-sources.txt
javac -nowarn -source 8 -target 8 -cp "$DEPS" -d "$BUILD_DIR" @/tmp/sdk-sources.txt 2>/dev/null

echo "==> 编译示例..."
javac -nowarn -source 8 -target 8 \
  -cp "$DEPS:$BUILD_DIR" \
  -d "$BUILD_DIR" \
  "$SCRIPT_DIR/ChatCompletions.java" 2>/dev/null

echo "==> 运行示例..."
java -cp "$DEPS:$BUILD_DIR" cls.v20201016.ChatCompletions

exit 0

正常响应：

./examples/cls/v20201016/run.sh
==> 编译 SDK...
==> 编译示例...
==> 运行示例...
\```sql
status:200 | SELECT count(*) AS log_count
\```

**Verification Result:** The query syntax check passed successfully.

**Brief Explanation:** This CQL statement retrieves logs with HTTP status code 200 from the Nginx access logs and counts the total number of these successful request logs. The `status:200` filter in the search condition selects only logs where the status field equals 200, and the SQL `count(*)` function calculates the total number of matching log entries.
[流式] 完成，开始非流式调用...
思考过程：
[非流式] 回复内容：
\```sql
status:200 | SELECT count(*) AS log_count
\```

**Verification Result:** The query syntax is valid.

**Explanation:** 
1. **Search Condition:** `status:200` retrieves all logs where the status field equals 200.
2. **Analytics:** `SELECT count(*) AS log_count` counts the number of logs that match the search condition and labels the result as "log_count".
3. The field "status" is in the log topic's index configuration with long data type and statistics enabled.

This CQL statement meets your requirement to count logs with status code 200.

错误处理：

./examples/cls/v20201016/run.sh
==> 编译 SDK...
==> 编译示例...
==> 运行示例...

[流式] error {"Code":"ResourceNotFound.TopicNotExist","Message":"topic_id \"xxxxxxxx-xxxx\" does not exist."}

[流式] 完成，开始非流式调用...
[TencentCloudSDKException]code: ResourceNotFound.TopicNotExist message:topic_id "xxxxxxxx-xxxx" does not exist. requestId:dd6e7172-12fe-4416-ba36-8d3567031d04
        at com.tencentcloudapi.common.AbstractClient.processResponseJson(AbstractClient.java:638)
        at com.tencentcloudapi.common.AbstractClient.internalRequest(AbstractClient.java:559)
        at com.tencentcloudapi.cls.v20201016.ClsClient.ChatCompletions(ClsClient.java:84)
        at cls.v20201016.ChatCompletions.main(ChatCompletions.java:104)