Flink: Add SnapshotPropertyGenerator interface to support dynamic snapshot metadata #14594
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Resolves #14160
Currently, the FlinkSink only supports specifying static snapshot properties at build time via the builder API. There is no built-in way to set or customize snapshot properties dynamically for each commit or checkpoint. Extend the FlinkSink to allow users to provide a function that generates snapshot properties dynamically. This would enable users to inject custom metadata, such as row counts, min/max timestamps, or task-specific annotations into Iceberg snapshots at runtime.
Similar to how snapshot-property.custom-key works in Spark.