Added request-reply support for commands

[roblaszczak]

[AlexCuse]

This is awesome I've stitched together an ad-hoc equivalent to this at least a few times be nice to have something available in package.

[AlexCuse]

Been thinking about this a lot you may want to drop the CQRS namespace since request / reply is generally useful in a lot of situations. I don't have a great name in mind though. We built it into the message bus client for edgexfoundry mainly for the performance benefits that come with sending command/control messages to local device services without using HTTP.

The messagebus implementation is not really too much different than a composite of a WM publisher and subscriber. Its super easy to adapt between the two. In case you want to look could start here https://github.com/edgexfoundry/go-mod-messaging/blob/main/internal/pkg/request.go

[qiulin]

Is there any process?