feat: Update SIMAP endpoint definitions and improve link telemetry handling

    def __init__(self, context_client : ContextClient):

        self._context_client = context_client

        self._object_cache : Dict[Tuple[str, str], Any] = dict()

        # self.populate_all_cache()       # Added for testing purposes; can be removed.

        # self.populate_all_cache()       # NOTE: Added for testing purposes; can be removed.

    def get(

        self, entity : CachedEntities, *object_uuids : str,

class NodeTelemetry:

    ENDPOINT = '/ietf-network:networks/network={:s}/node={:s}/simap-telemetry:simap-telemetry'

    ENDPOINT = '/ietf-network:networks/network={:s}/node={:s}'

    def __init__(self, restconf_client : RestConfClient, network_id : str, node_id : str):

        self._restconf_client = restconf_client

class LinkTelemetry:

    ENDPOINT = '/ietf-network:networks/network={:s}/ietf-network-topology:link={:s}/simap-telemetry:simap-telemetry'

    ENDPOINT = '/ietf-network:networks/network={:s}/ietf-network-topology:link={:s}'

    def __init__(self, restconf_client : RestConfClient, network_id : str, link_id : str):

        self._restconf_client = restconf_client

    def get(self) -> Dict:

        endpoint = LinkTelemetry.ENDPOINT.format(self._network_id, self._link_id)

        telemetry : Dict = self._restconf_client.get(endpoint)

        return telemetry

        link : Dict = self._restconf_client.get(endpoint)

        return link.get('ietf-network-topology:link', [{}])[0].get('simap-telemetry:simap-telemetry', {})

    def update(

        self, bandwidth_utilization : float, latency : float,

    def delete(self) -> None:

        endpoint = LinkTelemetry.ENDPOINT.format(self._network_id, self._link_id)

        self._restconf_client.delete(endpoint)

        link     = {'link-id': self._link_id, 'simap-telemetry:simap-telemetry': {}}

        network  = {'network-id': self._network_id, 'ietf-network-topology:link': [link]}

        payload  = {'ietf-network:networks': {'network': [network]}}

        self._restconf_client.patch(endpoint, payload)

class Link: