Enable a feature so user can list images based on last pulling date

**What is the problem you're trying to solve**
We wanted to delete all the images with layers which are stale on acr and not in use.

**Describe the solution you'd like**
We would like to free up some spaces from acr and looking for a functionality so we get get list of images which are not pulled from ACR in a given time period(e.g. 60 days)

**Additional context**
If this functionality can be achieved with a az-cli script that also fine. We have 120+ repositories in ACR and we just wanted to run a task from acr or any ci/cd tool so it can check the images under all repository based on last pulling date and we can delete them which are older than a given time period.