Create a stubbed FlightSQL sample application

The goal of the sample application is to demonstrate how the FlightSQL API can be used for other common business intelligence application with a SQL like interface.

**Reporter**: [Tiffany Lam](https://issues.apache.org/jira/browse/ARROW-12926) / @tifflhl

_{**Note**: *This issue was originally created as [ARROW-12926](https://issues.apache.org/jira/browse/ARROW-12926). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

Issue 中沒有指定檔案、測試或進入點。首先檢查現有的 Java 專案及其對 FlightSQL API 的支援，然後定義一個具備 stub 的範例應用程式，透過類似 SQL 的介面示範常見的商業智慧用法；範例存在並示範該流程即視為完成。

由索引模型根據 Issue 內容生成。