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[SPARK-49025][CONNECT] Make Column implementation agnostic
### What changes were proposed in this pull request? This makes Column API implementation agnostic. We do this by: - Removing `Column.expr`. This has been replaced in the source by either the use of `Column` itself, the use of an Expression that wraps a ColumnNode, or by (implicit) conversions. - Removing `Column.apply(e: Expression)`. This has been replaced in the source by the `ExpressionUtils.column` (implicit) method, or by the use of `Column`. - Removing `TypedColumn.withTypedColumn(..)`. This has been replaced by direct calls to `TypedAggUtils.withInputType(...)`. - Removing `Column.named` and `Column.generateAlias`. This has been moved to `ExpressionUtils.`. - Making a bunch of pandas and arrow operators use a Column instead of an Expression. ### Why are the changes needed? This is one of the last steps in our effort to unify the Scala Column API for Classic and Connect. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Existing tests. ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#47785 from hvanhovell/SPARK-49025. Authored-by: Herman van Hovell <herman@databricks.com> Signed-off-by: Herman van Hovell <herman@databricks.com>
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