[Feature][connector] Support ignore delete for Log Table

[wuchong]

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Motivation

In flink, the join operation may produce retractions, if writing join result into an append-only sink will throw plan exception. However, in some cases, users want to use Log Table as the sink of join operation. We can introduce a sink.ignore-delete option for the sink connector, and ignore deletions when the option is enabled.

Solution

No response

Anything else?

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Willingness to contribute

• I'm willing to submit a PR!