Allow to specify annotation/labels for the Workspace

[benoitf]

Description

With che server workspaces, we could add custom labels and custom annotations to the Deployment/Pod kubernetes object

Additional context

I would like to have the same set of feature by adding extra configuration in the DevWorkspace object

so for example if user provides to Dashboard : ?override.labels.foo=bar then Dashboard can add an extra configuration for foo=bar label into the DevWorkspace and the controller can then apply that label on top of the Deployment/DevWorkspace/Pod objects.

It could be like

devWorkspace.spec.labels and devWorkspace.spec.annotations entries