deleteAtSign method
Deletes the atsign
from device storage.
Implementation
Future<void> deleteAtSign(String atsign) async {
await _keyChainManager.deleteAtSignFromKeychain(atsign);
atClientServiceMap!.remove(atsign);
monitorConnectionMap!.remove(atsign);
if (atsign == currentAtsign) currentAtsign = null;
if (atsign == lastOnboardedAtsign) lastOnboardedAtsign = null;
atSignsList!.remove(atsign);
}