Context menu item to scale Deployments

[datho7561]

It might be nice to provide a context menu item to scale deployments.

eg. see this issue for intellij-kubernetes: redhat-developer/intellij-kubernetes#615

[datho7561]

Here's what the workflow looks like in intellij-kubernetes:

scale-deployment-intellij.mp4

Here's what I think the workflow should be:

1. Right click a deployment in the context menu, and select "Scale"
2. Enter a number (positive or zero) using a quick pick to specify the new number of replicas
3. The deployment is scaled to the new number of replicas