Add a functional test cases (not unit) to daprsdk

[VenkateshSrini]

@cecilphillip , How will you write a functional test case using XUnit for those applications that using Dapr SDK? Do you have any mocks (MOQ preferred) Dapr SDK? This is highly required where the build server will not have DAPR platform /container engine and only the deployment environment will have Kubernetes installed

[cecilphillip]

@VenkateshSrini yea, I should do that at some point. Maybe someone will send me a PR for that

[VenkateshSrini]

Is there some mocking strategy to simulare DPR response in functional test. May I can try it