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!

No source files, tests, reproduction steps, or build entry points are named. Start by inspecting the repository's build configuration and existing platform support, then determine what is required to cross-compile for Arm and Mipsel Linux. Done means a documented, working cross-compilation path for both targets with appropriate validation.

Written by the indexing model from the issue text.