fix: TAP-9678 StarRocks cache data is incomplete

[mnianqi]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds flush-offset callback plumbing so targets (e.g., StarRocks) can receive complete offset metadata after a successful flush.

Changes:

• Introduced TapCallbackOffset to package batch/stream offsets plus table, stage, timestamps, and nodeIds.
• Extended TapConnectionContext with a flushOffsetCallback (Consumer<Object>) hook to deliver the offset payload.
• Added ConnectionOptions.FLUSH_OFFSET_CALLBACK option key for wiring/configuring the callback.

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[augmentcode]

Review completed. 2 suggestions posted.

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