Sort options for DataType::Dictionary is incorrect

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Looks like when the DataType is `Dictionary`, it always reset the Nulls First settings and ignore the sort option from the query engine. This will generate wrong sort result. I will add a UT to reproduce the issue.

https://github.com/apache/arrow-rs/blob/a0a5880665b1836890f6843b6b8772d81c463351/arrow-ord/src/sort.rs#L316-L332

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Start by reading arrow-ord/src/sort.rs around lines 316-332 and reproduce the Dictionary sorting case described in the issue. Add the promised unit test covering nulls-first settings, then verify that sorting respects the query engine's sort option and produces the correct result.

Written by the indexing model from the issue text.