saveHubIdentity function
Saves identity's seeds to path (the host's rotation/rebind path).
Implementation
Future<void> saveHubIdentity(String path, HubIdentity identity) async {
await File(path).parent.create(recursive: true);
await File(
path,
).writeAsString(await hubIdentityToKeyFile(identity), flush: true);
await _chmod600(path);
}