Provide APIs to create and delete resources for plugins to use

[mengdie-song]

Describe the problem/challenge you have
I would like to switch to DashboardClient for antrea-octant-plugin, so that the plugin can pick up context switches from octant dashboard. My plugin needs to create and delete specific CRDs which can be supported by plugin self-generated client using client-go and kubeconfig previously. However, there are no APIs for create and delete resources defined in Dashboard interface (https://github.com/vmware-tanzu/octant/blob/master/pkg/plugin/service/dashboard.go#L16) which I can invoke. It would be great if octant can provide create and delete resources APIs for plugin to use.

Describe the solution you'd like
Add Create and Delete APIs to Dashboard interface with their implementations, so that plugins can use to create and delete resources of their own.

Environment:

• Octant version (use octant version): 0.16.1
• Kubernetes version (use kubectl version): v1.18.5
• OS (macOS 10.15, Windows 10, Ubuntu 19.10 etc):Ubuntu 18.04.3

[wwitzel3]

Got another request for this on the Go plugin side of things, adding this to our 0.19 release.

[xtreme-vikram-yadav]

Picking it up