Introduce HTTP facade sample

[branimirangelov]

Interaction with modules will be managed by HTTP facade part of the fabric with the following responsibilities:

1. Locate module based on state locality (service discovery)
2. Use cache for handling invocation and response (retries and etc)

[branimirangelov]

Postpone since the inter-cluster module calls will be done using Ignite Thin Client

[branimirangelov]

Consider using Azure Functions HTTP triggers as the Facade rather than extending Fabric

[bojidar-bg]

Azure Functions were dropped as well, but it is possible to integrate Perper directly with an ASP.NET Host, thus serving as an HTTP facade.

I don't believe we need to do anything for this, except perhaps provide a sample/documentation. Retagging accordingly.