[FLINK-35805][transform] Add __data_event_type__ metadata column
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...-composer/src/test/java/org/apache/flink/cdc/composer/flink/FlinkPipelineComposerITCase.java
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__op_type__ metadata column__row_kind__ metadata column
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...me/src/main/java/org/apache/flink/cdc/runtime/operators/transform/TransformDataOperator.java
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flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/parser/TransformParser.java
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__row_kind__ metadata column__data_event_type__ metadata column
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This closes FLINK-35805.
Currently, event operation type (insert, update, or delete) was encoded in all
DataChangeEvents. However it's not possible to access them in transform blocks since it is not exposed as metadata column. Adding this should allow such transform usages: