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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Inizia leggendo arrow-ord/src/sort.rs intorno alle righe 316-332 e riproduci il caso di ordinamento di Dictionary descritto nell’issue. Aggiungi il test unitario promesso che copra le impostazioni nulls-first, quindi verifica che l’ordinamento rispetti l’opzione di ordinamento del motore di query e produca il risultato corretto.

Scritto dal modello di indicizzazione a partire dal testo della issue.