Add function to lock a machine

[dougpenny]

Code below provided by Rick Schuler:

def classic_lock_computer(self, id: int) -> Union[str, None]:
    """
    Create a new class in Jamf Pro.

    Args:
        new_class (Computer Id):
            Integer Id of the Device to lock

    Returns:
        If creation is successful, the ID of the machine
        otherwise, None.
    """
    data = f"<computer_command><general><command>DeviceLock</command><passcode>885344</passcode></general><computers><computer><id>{id}</id></computer></computers></computer_command>"
    class_response: Response = self.make_api_request("/JSSResource/computercommands/command/DeviceLock", data=data, method=[jamf.HTTPMethod.POST](http://jamf.httpmethod.post/), classic=True)
    if class_response:
        if class_response.status_code == 201:
            xml_data = ET.fromstring(class_response.text)
            return xml_data.findtext('id')
    else:
        return None