Feature request: Provide image pull progress in CachedImage CRD

[aDisplayName]

Hi,

We would like to monitor the progress of CachedImage pulling progress so that we can provide those information to the end user in our system.

Our system is deployed in the edge, and the estimated time left for pulling all image are very useful when local edge network speed are not optimal.

[aDisplayName]

I have prepared a PR for review. #400

[aDisplayName]

@plaffitt , I've submitted a new PR #519 which solved the problem you've pointed out on previous PR. Please take a look. Thank you.