Add monitoring data export via API

[ERnsTL]

• TODO display results on a webinterface? made in flowd or standard methods? or just export info via API?
• goal: can be visualized using grafana
• note: how to handle different performance metric fields for different kinds of components? maybe show all components' basic monitoring data in graph for all components and then a separate graph for eg. the video processing components = core components to watch out for and select on its specific performance data fields.