add flink support FLIP-510#8452
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Support key-only deletes on primary-key table sink (FLIP-510)
Advertise the FLIP-510 keyOnlyDeletes capability on primary-key table sinks so the Flink planner can drop the upstream ChangelogNormalize node when the source produces deletes by key.
This is especially useful for CDC sources, where the UPDATE_AFTER already carries the full row: dropping ChangelogNormalize removes its state and overhead with no loss of correctness.
Gated behind a new table option sink.key-only-deletes.enabled (default false), so existing plans are unchanged unless explicitly opted in. The API only exists in Flink 2.1+, so the behavior is wired through ChangelogModeUtils in paimon-flink1-common (no-op) and paimon-flink2-common (sets the flag), keeping paimon-flink-common compiling against both Flink 1.x and 2.x.
This PR has been tested in a real environment and drops correctly the ChangelogNormalize.