[Improve] Show Invalid Token Error Message

### Search before asking

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

### Version

2.9.3.11+

### Minimal reproduce step

pass an invalid token and try to create a producer

### What did you expect to see?

User error messages that specify the input token is invalid.

Error Checking/Getting Partition Metadata while creating producer on {topicName} -- InvalidToken

### What did you see instead?

Error Checking/Getting Partition Metadata while creating producer on {topicName} -- ConnectError

### Anything else?

Similar stack-overflow questions:

https://stackoverflow.com/questions/62227305/apache-pulsar-error-checking-getting-partition-metadata-while-subscribing

### Are you willing to submit a PR?

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

在建立 producer 時傳入無效 token 以重現此問題，然後追蹤 C++ client 中的分割區中繼資料錯誤路徑。當回報的錯誤識別為 InvalidToken 而非 ConnectError，並與預期訊息一致時，即表示完成。

由索引模型根據 Issue 內容生成。