[datasource] Add support for base image deprecation

[noqcks]

What would you like to be added:

Motivated by this LinkedIn post by Rory McCune

We should be able to identify and flag deprecated base images. There is work in the oci-spec around annotations to signal deprecation, but it's not yet completed. https://github.com/opencontainers/image-spec/pull/903

An alternative would be of Dockerhub or other registries supported a deprecation flag.