Bug: incorrectly ignores OFFSET clause (Spark 3.4+)

[yew1eb]

Since Apache Spark 3.4 (SPARK-28330), the physical plan fully represents OFFSET:

• GlobalLimitExec and TakeOrderedAndProjectExec carries an explicit offset field
• When both LIMIT and OFFSET are present, Spark stores limit + offset as the raw limit value

The current auron completely ignores the offset field.
As a result, the query:

SELECT * FROM t LIMIT 10 OFFSET 5

return the first 15 rows instead of rows 6–15, producing incorrect results.

We should fully support the LIMIT … OFFSET … semantics.