How about Cross compile Pulsar Client Cpp for Arm and Mipsel Linux?

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar-client-cpp/issues) and found nothing similar.

### Version

Ubuntu 22.0, cross compile Pulsar CLient C++ for Mipsel Linux

### Minimal reproduce step

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### What did you expect to see?

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### What did you see instead?

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### Anything else?

_No response_

### Are you willing to submit a PR?

- [X] I'm willing to submit a PR!

未指定源文件、测试、复现步骤或构建入口点。先检查仓库的构建配置和现有的平台支持，然后确定为 Arm 和 Mipsel Linux 进行交叉编译所需的内容。对于这两个目标，都有一条有文档记录且可正常工作的交叉编译路径，并进行适当的验证，即视为完成。

由索引模型根据 Issue 内容生成。