Delete keychain if first launch

[Alix-MICHEL]

It would be nice if network stack could delete automatically the keychain after the app's first launch, based on a user defaults key.

let alreadyLaunched = Defaults[.alreadyLaunched]

if alreadyLaunched == false || alreadyLaunched == nil {
  do {
    try KeychainService(serviceType: KeychainServiceType.sbwa.rawValue).removeAll()
    Defaults[.alreadyLaunched] = true
  } catch {
    print("KeychainService: Failed to remove all keys")
  }
}