Display list of commands from the local devfile in odo describe component output

[rm3l]

/kind user-story

User Story

As an odo user, I want to see the list of commands that are defined in my local devfile, So that I can know which command I can execute with odo run, without having to read the full Devfile.
It will also help IDE extensions adopt the odo run workflow by allowing users to select the command they want to manually execute with odo run.

Acceptance Criteria

• odo describe component should include the list of commands that are defined in the current Devfile
  • Human-readable output
  • JSON output
• For each command, it should display information like:
  • command name (ID)
  • command line if exec
  • component (container if exec)
  • command type, e.g: exec, apply
  • command group if any
  • image name for image components
  • [ ] whether the command is hot-reload capable (?)
  • [ ] For exec and apply commands, the component name
  • [ ] For exec commands, the working dir (?)
  • [ ] whether the command is bound to a lifecycle event (?)
• If the Devfile does not have any commands (e.g. with the UDI stack), there should be no commands section in the human-readable or JSON outputs
• odo describe component --name (i.e., without local devfile) should not display such information

*(?) => to discuss

Examples:

odo describe component

$ odo describe component             

--- TRUNCATED ---

Kubernetes components:
 •  outerloop-deploy
 •  outerloop-deploy-ocp

Commands:
 •  00-install
   Type: exec
   Group: build
    Component: runtime
   Component Type: container
    Command-line: yarn
 •  01-run
   Type: exec
   Group: run
   Component: runtime
   Component Type: container
   Command-line: yarn start
 •  02-debug
   Type: exec
   Group: debug
   Component: runtime
   Component Type: container
   Command-line: yarn debug
 •  03-test
    Type: exec
    Group: test
    Component: runtime
   Component Type: container
    Command-line: yarn test
 •  20-build-image
    Type: apply
    Component Type: image
    Component: outerloop-build
    Image name: my-dev-image
 •  211-deploy-k8s
   Type: apply
   Component Type: kubernetes
    Component: outerloop-deploy
 •  212-deploy-ocp
   Type: apply
   Component Type: openshift
    Component: outerloop-deploy
 •  22-deploy
    Type: composite
    Group: deploy

odo describe component -o json

{
--- TRUNCATED ---
  "commands": [
    {
      "name": "00-install",
     "type": "exec|apply|composite|...",
     "group": "",
     "isDefaultCommand": true|false,
     "commandLine": "",
     "component": "",
     "componentType": "image|kubernetes|...",
     "imageName": "my-dev-image"
    }
...
  ]
}

Links

• Related Epic (mandatory): Compatibility with DevSpaces devfiles.  #6478

/kind user-story