fix: added UUID generation for service_function_id

import connexion

import logging

import uuid

from os import environ

from sunrise6g_opensdk import Sdk as sdkclient

    try:

        payload = connexion.request.get_json()

        if not payload.get("appId"):

            payload["appId"] = str(uuid.uuid4())

        response = edgecloud_adapter.onboard_app(payload)

        return _safe_http_json_response(response)

    except Exception as e: