[feature request] C++ client support producer access mode.

### Search before asking

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

### Motivation

The current java client supports four access modes: `Shared`, `Exclusive`, `ExclusiveWithFencing`, and `WaitForExclusive`.

C++ and Python also needs support.

The issue is responsible for tracking, and specific tasks can be disassembled to do.

### Solution

Refer PIP:
1. [PIP 68: Exclusive Producer](https://github.com/apache/pulsar/wiki/PIP-68%3A-Exclusive-Producer)
2. [PIP161: ExclusiveWithFencing](https://github.com/apache/pulsar/issues/15528)

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start by reading PIP 68: Exclusive Producer and PIP161: ExclusiveWithFencing, then compare their supported producer access modes with the current C++ client. The issue is a tracking request rather than a scoped task, so the completed work and specific files are not defined here.

Written by the indexing model from the issue text.