ICommandInvoker<T> for fast "Mediator" approaches in ASP.Net Core pages

Basically just skip the silly "look up the message type handler" step within CommandBus.

So the signature would be something like just InvokeAsync(T message, CancellationToken token) : Task. Maybe pair this with some kind of Minimal API helper. Would allow you to use Jasper middleware strategies w/o having to have a new Jasper.Http