Add get_edge_cloud_zones endpoint

# Mocked API for testing purposes

from typing import Dict, List, Optional

from typing import Optional

from src.edgecloud.core.edgecloud_interface import EdgeCloudManagementInterface

from typing import Dict, List, Optional

from .common import I2EdgeError, i2edge_delete, i2edge_get, i2edge_post, i2edge_post_multiform_data

class EdgeApplicationManager(EdgeCloudManagementInterface):

    def __init__(self, base_url: str):

        self.base_url = base_url

    def get_edge_cloud_zones(self) -> list[dict]:

        url = "{}/zones/list".format(self.base_url)

        try:

            response = i2edge_get(url, params=None)

            return response

        except I2EdgeError as e:

            raise e

    def onboard_app(self, app_manifest: Dict) -> Dict:

        print(f"Submitting application: {app_manifest}")

        return {"appId": "1234-5678"}