Add gRPC method scope to protoregistry

Paul Okstad (ex-GitLab)requested to merge
po-method-info-scope into master

This change adds the scope level of an RPC to the method info. It is needed to enable the cache interceptor to safely ignore RPC's that do not pertain to a repository.

Needed for #1631 (closed)

Edited by GitLab Release Tools Bot

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