[SPARK-44531][CONNECT][SQL] Move encoder inference to sql/api #42134
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What changes were proposed in this pull request?
This PR move encoder inference (ScalaReflection/RowEncoder/JavaTypeInference) into sql/api.
Why are the changes needed?
We want to use encoder inference in the spark connect scala client. The client's dependency to catalyst is going away, so we need to move this.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Existing tests.