Referencing container images with SHA digest instead of image tags in the CSV yaml file

[chaitanya1731]

As per the new certification requirements, any container image used in the csv yaml file needs to be referenced via SHA key instead of image tag, this update also requires you to replace all the container images specified in the alm examples section with their respective SHA keys to pass all certification test cases as well, in such case, how do we work with container images version numbers? How do we validate particular SHA key in case users enter a wrong one? this also affects the capability level 2 "seamless upgrades" as we cannot validate the current container image with SHA specifically.