[model_worker] should `worker-address` argument need to be changed when `host` or `port` arguments are changed?

Nobody has claimed this yet.

Hello! I'm a student interested in this repo.
I found that if `model_worker`'s `host` or `port` is changed, `worker_address` should be changed accordingly.
(Because the `controller` will access `worker` via `worker_address`.)

If what I found is correct thing, I want to add some logic or helper messages for proper match of `host`, `port` and `worker_address`.

Followings are options what I'm going to add.
1. Automatically Construct worker_address. (`args.worker_address = f"http://{host}:{port}"`)
2. Add Help Message. (`parser.add_argument("--worker-address", help=~~~, ...)`)
3. Add assertions about matching of `host`, `port` and `worker_address` under the argument parser code, and if it doesn't match each other, return error message.

Could my team work on this Issue? (And sorry for the uneven English expression.)

---
---

``` python
# model_worker.py
def create_model_worker():
parser = argparse.ArgumentParser()
parser.add_argument("--host", type=str, default="localhost")
parser.add_argument("--port", type=int, default=21002)
parser.add_argument("--worker-address", type=str, default="http://localhost:21002")
...
```

``` python
# model_worker.py
if __name__ == "__main__":
args, worker = create_model_worker()
uvicorn.run(app, host=args.host, port=args.port, log_level="info")
```
uvicorn is run on `args.host:args.port`

---

``` python
# model_worker.py
def register_to_controller(self):
logger.info("Register to controller")

url = self.controller_addr + "/register_worker"
data = {
"worker_name": self.worker_addr,
"check_heart_beat": True,
"worker_status": self.get_status(),
}
r = requests.post(url, json=data)
assert r.status_code == 200
```
register to controller with `worker_addr` argument.

Read model_worker.py, starting with the argument parser, the uvicorn startup call, and register_to_controller. Confirm how host, port, and worker-address are used, then establish the expected behavior for mismatched values and verify that the worker listens at the address registered with the controller.

Written by the indexing model from the issue text.