Add proto validator into istio/api and istio/istio #3110
Description
Using https://github.com/lyft/protoc-gen-validate
In progress testing their validator, opened issue: https://github.com/lyft/protoc-gen-validate/issues/56
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Using https://github.com/lyft/protoc-gen-validate
In progress testing their validator, opened issue: https://github.com/lyft/protoc-gen-validate/issues/56