Rename command group type

[maysunfaisal]

As odo is working on consuming the v2 spec, i noticed that the command group kind is called command group type https://github.com/devfile/kubernetes-api/blob/master/pkg/apis/workspaces/v1alpha1/commands.go#L20

// CommandGroupType describes the kind of command group.
// +kubebuilder:validation:Enum=build;run;test;debug
type CommandGroupType string

Can we please rename this to CommandGroupKind to be consistent with the discussion here in #27 and also devfile actually uses kind instead of type:

commands:
  - exec:
      id: devBuild
      component: runtime
      commandLine: npm install
      workingDir: ${CHE_PROJECTS_ROOT}/nodejs-web-app/app
      group:
        kind: build
        isDefault: true

[l0rd]

@maysunfaisal you are right. We need to address that. If you have the chance don't hesitate to open a PR.

[davidfestal]

Fxed in PR #94