Feature Request: Custom listener_name for Functions

### Search before asking

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

### Motivation

The motivation of this feature comes from: #21088
To be more specific from [this comment](https://github.com/apache/pulsar/issues/21088#issuecomment-1717797667).

Currently, when creating a function worker / sink / source one can assign a custom `broker-service-url` but not a `listener_name` usable through the brokers `advertisedListeners`, hence preventing running workers on dedicated machines outside of the brokers network (as far as I'm aware of).

### Solution

Enable function workers / sinks / sources to be created with a custom `--listener_name` flag used by the client.

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

The issue names no files or tests. Start by locating the function worker, sink, and source creation paths and the existing broker-service-url option; trace how client settings are passed, then verify that a custom listener_name is accepted and used with advertisedListeners.

Written by the indexing model from the issue text.