[Java] Make sure Netty Allocator has correct behavior with empty ArrowBuf

Include a test which ensures that the Netty Allocator returns an empty-behaving byte buffer when users allocate a zero byte buffer

**Reporter**: [Ji Liu](https://issues.apache.org/jira/browse/ARROW-8870) / @tianchen92

_{**Note**: *This issue was originally created as [ARROW-8870](https://issues.apache.org/jira/browse/ARROW-8870). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

首先定位 Netty allocator 及其对零字节 ArrowBuf 分配的处理方式。添加所请求的分配零字节缓冲区的回归测试，并验证返回的字节缓冲区表现为空。该 issue 未指明源文件或测试文件，因此首先需要搜索 repository。

由索引模型根据 Issue 内容生成。