Show charts for CPU/Memory usage etc on Cluster page

[kenlasko]

I make heavy use of Headlamp's main Cluster overview page, where it gives an overview of the environment, including the following in ring chart format:

• CPU utilization
• Memory usage
• Pods
• Nodes

This can be filtered by namespace.

Below that are a list of recent events, which can be filtered by warnings or higher. This would be awesome to have in Kubewall at some point.

[kshitijmehta]

Thank you @kenlasko for these feedback and suggestions ! We'll add this one to the feature list.