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 中没有指定文件、测试或入口点。首先检查现有的 Java 项目及其对 FlightSQL API 的支持，然后定义一个带有存根的示例应用，通过类似 SQL 的接口演示常见的商业智能用法；示例存在并演示该流程即视为完成。

由索引模型根据 Issue 内容生成。