api: add `discovery_service` field to `ProxyConfig`

[yskopets]

Signed-off-by: Yaroslav Skopets [email protected]

Summary

• this PR adds discovery_service field to ProxyConfig
• part of https://github.com/istio/istio/issues/29108

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[yskopets]

/test release-notes_api

[costinm]

I would suggest instead starting with a doc ( RFC, etc) describing the current distribution mechanism and options for roots of trust, and if we want to make change, have a clear explanation of migration and how the new mechanism should look like. It's too critical change to make directly in the API.

[istio-testing]

@yskopets: PR needs rebase.

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