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metadatahandler: Expose method scope and operation

Patrick Steinhardt requested to merge pks-metadatahandler-expose-method-operation into master

We log a bunch of gRPC information via the metadatahandler package. In several contexts though we have been wishing for rough classifiers of gRPC methods so that we can for example easily filter for all methods that mutate a repository.

Introduce two new fields:

- "grpc.meta.method_operation" denotes whether the RPC is an
  accessor-, mutator- or maintenance-style RPC.

- "grpc.meta.method_scope" denotes whether the RPC is repository- or
  storage-scoped.

With this it becomes a lot simpler to filter full categories of RPCs.

Closes #5450 (closed).

Edited by Patrick Steinhardt

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