Add state to each message and allow users to resend failed messages

[FabioRosado]

On opsdroid v 2 each message contains the following:

export type MessageType = {
  text: string;
  user: string;
  timestamp: Date;
  image?: string;
};

We should also add a state which will be one of the following:

• Sending
• Sent
• Error

If we have a message in an error state, we should do the following:

• Show an error icon next to he message
• Show a tooltip above the icon with the error message
• Upon clicking we will try to resend the message again