### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Currently, the default port range for external services is configured in `config.py` as follows:
https://github.com/localstack/localstack/blob/075a6fcfcc29af99e1997d73abea6e88351f3c84/localstack/config.py#L462-L472
This means that the default service range is: (4510,4540]
But the example `docker-compose.yml` states (4510, 4530):
https://github.com/localstack/localstack/blob/075a6fcfcc29af99e1997d73abea6e88351f3c84/docker-compose.yml#L12

The currently stated 20 ports can already be somewhat limiting if a lot of external services are started (f.e. lots of clusters or databases). Therefore the range should be broadened and correctly defined in our example `docker-compose.yml` file.

### 🧑‍💻 Implementation

- [x] Broaden the service port range to 50 ports.
- [x] Update the example docker-compose file.

### Anything else?

_No response_
from subprocess import CalledProcessError
    from localstack.cli import console
    dirname = os.getcwd()
    compose_file_name = name if os.path.isabs(name) else os.path.join(dirname, name)
    warns = []
    
    cmd = ["docker-compose", "-f", compose_file_name, "config"]
    try:
        run(cmd, shell=False, print_error=False)
    except CalledProcessError as e:
        msg = f"{e}\n{to_str(e.output)}".strip()
        raise ValueError(msg)
    
    import yaml  
    with open(compose_file_name) as file:
        compose_content = yaml.full_load(file)
    services_config = compose_content.get("services", {})
    ls_service_name = [
        name for name, svc in services_config.items() if "localstack" in svc.get("image", "")
    ]
    if not ls_service_name:
        raise Exception(
            'No LocalStack service found in config (looking for image names containing "localstack")'
        )
    if len(ls_service_name) > 1:
        warns.append(f"Multiple candidates found for LocalStack service: {ls_service_name}")
    ls_service_name = ls_service_name[0]
    ls_service_details = services_config[ls_service_name]