vela-cli support use "vela system cue-packages" to list cue-package

[yangsoon]

fix #1404

use vela system cue-packages to show what are the inner packages supported in cluster

$ vela system cue-packages
Definition-Name                 Import-Path                                      Usage                                                      
#Event                          kube/events.k8s.io/v1beta1                      Kube Object for events.k8s.io/v1beta1.Event                                 
#Event                          k8s.io/events/v1beta1                           Kube Object for events.k8s.io/v1beta1.Event                                 
#RolloutTrait                   kube/standard.oam.dev/v1alpha1                  Kube Object for standard.oam.dev/v1alpha1.RolloutTrait                      
#PodSpecWorkload                kube/standard.oam.dev/v1alpha1                  Kube Object for standard.oam.dev/v1alpha1.PodSpecWorkload                   
#CustomResourceDefinition       k8s.io/apiextensions/v1                         Kube Object for apiextensions.k8s.io/v1.CustomResourceDefinition            
#CustomResourceDefinition       kube/apiextensions.k8s.io/v1beta1               Kube Object for apiextensions.k8s.io/v1beta1.CustomResourceDefinition 

[codecov]

Codecov Report

Merging #1417 (b6a1a96) into master (4b25ed4) will decrease coverage by 3.30%.
The diff coverage is n/a.

❗ Current head b6a1a96 differs from pull request most recent head 0acaad2. Consider uploading reports for the commit 0acaad2 to get more accurate results

@@            Coverage Diff             @@
##           master    #1417      +/-   ##
==========================================
- Coverage   54.74%   51.44%   -3.31%     
==========================================
  Files          76       81       +5     
  Lines        7306     8013     +707     
==========================================
+ Hits         4000     4122     +122     
- Misses       2820     3390     +570     
- Partials      486      501      +15     

Flag	Coverage Δ
unittests	51.44% <ø> (-3.31%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...aits/traitdefinition/traitdefinition_controller.go	51.42% <0.00%> (-25.72%)	⬇️
...dev/v1alpha2/application/application_controller.go	52.63% <0.00%> (-2.00%)	⬇️
pkg/oam/util/helper.go	67.19% <0.00%> (-1.97%)	⬇️
...am.dev/v1alpha2/applicationconfiguration/render.go	86.17% <0.00%> (-0.17%)	⬇️
...plicationconfiguration/applicationconfiguration.go	83.63% <0.00%> (-0.07%)	⬇️
...ntroller/common/rollout/rollout_plan_controller.go	0.00% <0.00%> (ø)
...ev/v1alpha2/applicationrollout/mutating_handler.go	0.00% <0.00%> (ø)
...n/rollout/workloads/cloneset_rollout_controller.go	0.00% <0.00%> (ø)
pkg/controller/common/rollout/workloads/common.go	94.73% <0.00%> (ø)
...mon/rollout/workloads/cloneset_scale_controller.go	0.00% <0.00%> (ø)
... and 7 more

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[wonderflow]

please add a doc for it.

[wonderflow]

LGTM