Feature: Load existing on services on start + async container manager

I added an endpoint to the platform API (GET /api/services) that returns all of the clients services.

On start, the virtual server will request services to run, and start them one concurrently using golangs channel features (containers to run are added to a queue where up to five containers are handled at a time)

1. Add async container manager
2. Add API endpoint and start containers on virtual server start