feat: Add cachedimage pulling progress status

[aDisplayName]

Add following property in CachedImage CRD

• spec.progress.available
• spec.progress.total

Upgrade Crd version from kuikv1alpha1 to kuikv1alpha1ext1
Update the status.progress.available in CachedImage CRD every 5 seconds during the image pulling in cachedimage controller

[aDisplayName]

The PR is prepared for supporting the feature of #401

[plaffitt]

Thanks for your work! It looks interesting, this feature can be useful indeed. We will discuss soon with the rest of the team if we are interested in merging it. For my part I would do it. However there is a lot of commits and I will have to review all of them, which will take a bit of time so I hope you're not in a hurry 😅

[aDisplayName]

@paullaffitte , those commits can be grouped to the following three catalogs:

1. The CRD Change
2. The change of reference of kuikv1alpha1 to kuikv1alpha1ext1 in all relative area
3. The controller change in cachedimage_controller.go and registry.go.

If it makes your life easier, I can create a new PR with three consolidated commits.

Before I'm doing that, one decision I would seek from you, are

• should we change the CRD version v1alpha1 for both cachedImage and repository, or just keep using it?
• If the decision is to change the CRD version, then which version would you like to be changed to?

Regards

[aDisplayName]

I'm closing this PR. As I've submitted a new PR #402 with all the clutters removed.