Chat constructor
      
      Chat({})
     
    
    
Implementation
Chat({
  Signer? signer,
  required String account,
  String? decryptedPgpPvtKey,
  String? pgpPublicKey,
  required this.progressHook,
}) {
  _signer = signer;
  _account = account;
  _decryptedPgpPvtKey = decryptedPgpPvtKey;
  _userAPI = UserAPI(account: account);
  group = GroupAPI(
      account: account,
      progressHook: progressHook,
      decryptedPgpPvtKey: _decryptedPgpPvtKey,
      pgpPublicKey: pgpPublicKey,
      signer: _signer);
}