simonsssu

make Flink iceberg sink work without checkpoint enabled.

4

Current Flink Iceberg Sink depends on checkpoint to do commit. If we don't enable checkpoint, the data will not be commit into iceberg. so we have to do an improvement.

[AMORO-3940] Flink config load will cause ClassCastException when dir…

1

Close #3940

### What happened? Since private Map loadFlinkConfig() returns Map , This line will cause some config with non-string value throws ClassCastException. ### Affects Versions master/0.8 ### What table formats are...