[Java][Dataset] Enable CSV file format

CSV was already supported in C++ Dataset API. This is to enable the format in Java side.

**Reporter**: [Hongze Zhang](https://issues.apache.org/jira/browse/ARROW-13569) / @zhztheplayer

_{**Note**: *This issue was originally created as [ARROW-13569](https://issues.apache.org/jira/browse/ARROW-13569). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

從 Java Dataset API 開始，並以 issue 的 CSV 要求為參考，將其格式支援與現有的 C++ Dataset API 進行比較。找出 Java 的進入點和相關的驗證涵蓋範圍，接著確認 Java 端已啟用 CSV，且其行為與所述的 C++ 支援一致。

由索引模型根據 Issue 內容生成。