Pipe: implement external sources strategy and MQTT extractor

[XNX02]

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[Copilot]

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/extractor/mqtt/MQTTPublishHandler.java:185

• Method name 'ExtractTable' should use lowerCamelCase to follow Java naming conventions. Consider renaming it to 'extractTable'.

private void ExtractTable(TableMessage message, MqttClientSession session) {

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/extractor/mqtt/MQTTPublishHandler.java:276

• Method name 'ExtractTree' should use lowerCamelCase to maintain consistency with Java naming conventions. Consider renaming it to 'extractTree'.

private void ExtractTree(TreeMessage message, MqttClientSession session) {

[Copilot]

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

[SteveYurongSu]

@luoluoyuyu PTAL