Names field mandatory for k8s/openshift, optional for plugins

[l0rd]

• alias should not be used anymore
• name should be mandatory for kubernetes/openshift/containers components
• name should be optional for plugins components
• If name is not specified for a component of type plugin it should be inferred from its id/url field (id/url are used as name if its not specified explicitly)

### a Devfile spec

- container:
     name: tooling-container # <-- mandatory
     image: busybox
     mountSources: true
     endpoints:
       - name: petclinic-web-server

- kubernetes:
     name: mongodb # <-- mandatory
     reference: .../deployment.yaml # <-- already have a metadata.name: 'database1'

- plugin:
     name: vscode-java # <-- optional
     id: ms-vscode/vscode-java/1.1.1

[l0rd]

Discussed and agreed on this spec.

[davidfestal]

Implemented