Referrer Response support for layouts

[sajayantony]

What is the version of your ORAS CLI

v1.1

What would you like to be added?

Consider how referrers in the layout may be implemented from - opencontainers/image-spec#1171

Why is this needed for ORAS?

Oras supports accessing and creating OCI layouts and should be handling referrers since 1.1 is now released.

Are you willing to submit PRs to contribute to this feature?

• Yes, I am willing to implement it.

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