Propagate split source metrics to QueryInputMetadata

[kekwan]

Description

Fixes #28870

Additional context and related issues

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## Event Listener
* Include connector split source metrics in io.trino.spi.eventlistener.QueryInputMetadata#connectorMetrics. ({issue}`28870`)

[raunaqmorarka]

can you add a test in TestEventListenerBasic ?
change looks ok to me

[kekwan]

can you add a test in TestEventListenerBasic ? change looks ok to me

Added, thanks

[raunaqmorarka]

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📥 Commits

Reviewing files that changed from the base of the PR and between a4e2d12 and 56ec6af.

📒 Files selected for processing (4)

• core/trino-main/src/main/java/io/trino/event/QueryMonitor.java
• core/trino-main/src/test/java/io/trino/connector/MockConnector.java
• core/trino-main/src/test/java/io/trino/connector/MockConnectorFactory.java
• testing/trino-tests/src/test/java/io/trino/execution/TestEventListenerBasic.java

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📝 Walkthrough

Walkthrough

The pull request modifies the QueryMonitor.extractPlanNodeStats method to merge split source metrics from stageInfo.stageStats().getSplitSourceMetrics() into the operator summaries before mapping them to plan nodes. The changes include test infrastructure enhancements to MockConnector and MockConnectorFactory to support split source metrics configuration, and a test update to validate the merged metrics are correctly included in connector metrics assertions.

Assessment against linked issues

Objective	Addressed	Explanation
Include split source metrics in QueryInputMetadata.getConnectorMetrics() by merging them in QueryMonitor.getQueryIOMetadata() [#28870]	✅

Out-of-scope changes

No out-of-scope changes detected. All modifications directly support the objective of incorporating split source metrics into QueryInputMetadata.getConnectorMetrics() through the QueryMonitor implementation and corresponding test infrastructure.

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