[DO-NOT-MERGE][SPARK-50128] Add stateful processor handle APIs using implicit encoders in Scala #48728
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What changes were proposed in this pull request?
Add stateful processor handle APIs using implicit encoders in Scala
Why are the changes needed?
Without the changes, users have to pass explicit SQL encoders for state types while acquiring an instance of the underlying state variable
Does this PR introduce any user-facing change?
Yes
How was this patch tested?
Existing unit tests
Was this patch authored or co-authored using generative AI tooling?
No