deleteConversation method
      
void
deleteConversation(
    
    
- ConversationInfo conversationInfo
Implementation
void deleteConversation(ConversationInfo conversationInfo) {
  ConversationRepo.deleteSession(
      conversationInfo.session.sessionId,
      conversationInfo.session.sessionType,
      NIMSessionDeleteType.localAndRemote,
      true);
  _deleteItem(conversationInfo.session.sessionId,
      conversationInfo.session.sessionType);
}