Provide easy message-level interactivity

[alikindsys]

Draft:
a function public Task<DiscordMessage> Interact(DiscordMessage), to be used like

var message = PrepareMessage();
var response = await Interact(message);

where response is the next message sent in the context of message (In the correct channel, and by the correct user).
For ease of use, also add overloads for any type that can be trivially converted into a DiscordMessage, such as Interact(DiscordEmbed), Interact(string), and Interact(Attachment).

Implementation notes:
DSharpPlus.Interactivity provides several useful functions to get the next message, but all are at a lower level than the proposed Interact