Collect and Display Resource Utilization of Underlying Backend

[schrieveslaach]

For users of the system it is often hard to know if the backend (K8s or Docker) is under high load and if it is okay to create a new app. Therefore, PREvant should provide a way to collect the hardware utilization of the backends and should provide information about in the UI.

Additionally, it should be open to custom data collections so it is possible to support third party tools like Rancher.