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Provides the hooks to output the data plane versions (Istio versions of the sidecar).
This is part of the implementation of istio/istio#17172 . To be complete, a second PR is needed in istio/istio to add the actual function (I have that one ready).
This PR does not yet include the tests.
@howardjohn If this implementation looks clean enough I will write the tests and push my PR that adds the proxy gathering to istio/istio.