[SPARK-52428] Add higher-order functions with lambda expression support

[rafafrdz]

Summary

• Add create_lambda helper for building LambdaFunction proto expressions
• Add 10 higher-order functions: transform, filter, exists, forall, aggregate, array_sort_with_comp, map_filter, transform_keys, transform_values, zip_with
• Remove dead array_sort stub with unimplemented!()

// Transform array: [1,2,3] -> [2,3,4]
transform(col("array"), col("x") + lit(1), "x")

// Aggregate: sum elements
aggregate(col("array"), lit(0), col("acc") + col("x"), "acc", "x")

Test plan

• 9 unit tests verifying lambda proto structure
• cargo build passes
• cargo fmt -- --check passes