HIVE-25159: Remove support for ordered results in llap external client library

[ShubhamChaurasia]

The issue with order by in llap external client is described in https://issues.apache.org/jira/browse/HIVE-25159

What changes were proposed in this pull request?

To resolve the above issue, we propose removing of order by handling in the llap external client library and let the clients do it at their end.

Why are the changes needed?

1. These changes are needed to make llap external client queries more performant, earlier they used to generate only a single split for order by queries.
2. Removing order by support also helps us to get rid of exception arising to due false detection of order by clause (it was specific to spark-llap and was done for that only).

Does this PR introduce any user-facing change?

It removes a config - hive.llap.external.splits.order.by.force.single.split

How was this patch tested?

Through existing unit tests

• org.apache.hive.jdbc.TestJdbcGenericUDTFGetSplits
• org.apache.hive.jdbc.TestJdbcGenericUDTFGetSplits2

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
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