New Feature: Dashboard Backend

[ichbinrich]

As a follow up issue from #272, there is a requirement to expose an API to be consumed by the UI, that could be achieved by creating a back-end component, e.g. a web server, that communicates with the Wayang core and provides the data collected, such as summary of the current jobs (Running Jobs), available platforms, just to give a couple of examples. Initially this component could be passive, i.e. only consumes data to show in the UI, potentially it could turn into an active component, allowing interact with Wayang, e.g. Submit a new job or cancel a running job.