Capture image metas information in kbld lock file and ensure it's consumed properly

Do the same as #113 but for the `kbld` native lock file.

_(forked from: https://github.com/vmware-tanzu/carvel-kbld/pull/132/commits/3d74e40ec8d788cfece06f77c0bb9500eb34933d#r711267072)_

---
Vote on this request

This is an invitation to the community to vote on issues, to help us prioritize our backlog. Use the "smiley face" up to the right of this comment to vote.

👍 "I would like to see this addressed as soon as possible"
👎 "There are other more important things to focus on right now"

We are also happy to receive and review Pull Requests if you want to help working on this issue.