app_config.json integration/replacement

[alari]

When a distributed/p2p application is developed, it needs to be deployed. Deployment to the Fluence network can be described as app_config.json. But Aqua language has no bindings to it: it can't import values from the app config to use node ids and service ids, can't generate app_config or any other means of deployment.

We need to integrate deployment configuration into Aqua workflow.