esp_ble_mesh_provisioner_get_node_table_entry() function

Pointer to the start of the node table.

After invoking the function to get the entry of nodes, users can use the "for" loop combined with the macro CONFIG_BLE_MESH_MAX_PROV_NODES to get each node's information. Before trying to read the node's information, users need to check if the node exists, i.e. if the *(esp_ble_mesh_node_t **node) is NULL. For example: ``` const esp_ble_mesh_node_t **entry = esp_ble_mesh_provisioner_get_node_table_entry(); for (int i = 0; i < CONFIG_BLE_MESH_MAX_PROV_NODES; i++) { const esp_ble_mesh_node_t *node = entry[i]; if (node) { ...... } } ```