Bo Gao

[SPARK-48755] State V2 base implementation and ValueState support

2

### What changes were proposed in this pull request? - Base implementation for Python State V2 - Implemented ValueState ### Why are the changes needed? Support Python State V2 API...

### What changes were proposed in this pull request? - Support deleteIfExists for TransformWithStateInPandas. - Added `close()` support for StatefulProcessor. ### Why are the changes needed? Add parity to TransformWithStateInPandas...

### What changes were proposed in this pull request? Implement MapState and TTL support for TransformWithStateInPandas ### Why are the changes needed? Bring parity to Scala on supported state variables...