[flink] Support cdc source #6606
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Purpose
This PR adds support to use Paimon as a Flink CDC Pipeline Source.
Tests
Tests are added to the
org.apache.paimon.flink.pipeline.cdc.sourcepackage ofpaimon-flink-cdcmodule to verify its correctnessAPI and Format
It changes the API by adding a new Flink source implementation.
Documentation
It introduces new features that are documented in docs/content/cdc-ingestion/flink-cdc-paimon-pipeline-connector.md.