### 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_
name: str
    image_name: str
    volumes: VolumeMappings
    ports: PortMappings
    entrypoint: str
    additional_flags: List[str]
    command: List[str]
    privileged: bool = True
    remove: bool = True
    interactive: bool = False
    tty: bool = False
    detach: bool = False
    inherit_env: bool = True
    logfile: Optional[str] = None
    stdin: Optional[str] = None
    user: Optional[str] = None
    cap_add: Optional[str] = None
    network: Optional[str] = None
    dns: Optional[str] = None
    workdir: Optional[str] = None
    def __init__(self, name: str = None):