Unable to Set Initial Database via JDBC Connection String Parameters

### Describe the bug, including details regarding any error messages, version, and platform.

When trying to set the initial/default database using the JDBC connection string for Arrow Flight SQL. It appears that none of the following connection string formats successfully set the initial database context:

* `jdbc:arrow-flight-sql://localhost:50051/databse`
* `jdbc:arrow-flight-sql://localhost:50051?database=db`
* `jdbc:arrow-flight-sql://localhost:50051?schema=db`

**Environment:**
* **Arrow Flight SQL JDBC Driver Version:** [Please specify the version you are using, 17.0.0（java 8） and 21.0.0]
* **Server Version:** Doris 2.1.8
* **Operating System:** openSUSE 15.6

未指定源文件或测试。首先，在所述的 Doris 2.1.8 环境中使用三个 JDBC URL 重现该问题，并检查 Arrow Flight SQL JDBC driver 如何处理连接参数。完成的标准是：某种受支持的 connection-string 形式能够选择所请求的初始数据库，或者将该限制连同明确的错误记录在文档中。

由索引模型根据 Issue 内容生成。