Write a component that can send a string message asynchronously and receive a response to and from a server.

• Request: "Hello" Response: "Hi" after a one second delay.
• Request: "Bye" Response: "Bye" The server closes the client connection.
• Request: "Ping" Response "Pong"
• Any other message should be considered invalid and an exception should be raised on the client.

The underlying protocol is of your choice as long as a single stable network connection is used.

Simultaneous send operations should be completed successfully.

The client should implement the following interface:

interface IClient
{
    Task<string> SendAsync(string message);
}

Client requests should be sent down the wire as soon as possible, this means a previous request shouldn't block the client from sending new ones to the server. The server then processes the requests and sends back the response.

Implement the following interface instead of the basic one:

interface IClient
{
    Task<IResponseMessage> SendAsync(IRequestMessage requestMessage);
    Task<TResponseMessage> SendAsync<TResponseMessage>(IRequestMessage requestMessage) where TResponseMessage: IResponseMessage;
}