[Feature Request] There is no Transaction Support in C++ client API

### Search before asking

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

### Version

We are actively using Apache pulsar in our C/C++ product, however we came across to an issue that there is no Transaction Client API's were support available. Could you please let us know, when this feature will be included in Pulsar Client API ? kindly include this as earl as it is very much needed for our product !!

Thanks alot!

### Minimal reproduce step

No Transaction support in C++ Client API

### What did you expect to see?

Pulsar must also support transaction in C++ client

### What did you see instead?

No Transaction Support in C++ client

### Anything else?

kindly Make this transaction support inorder to use Pulsar actively across all existing C++ products

### Are you willing to submit a PR?

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

该 issue 请求在 C++ 客户端 API 中支持事务，但没有指出文件、测试或入口点。首先定位现有的 C++ 客户端 API，以及项目其他位置的任何事务支持；要视为完成，需要明确的事务设计、实现范围和相应的测试。

由索引模型根据 Issue 内容生成。