Change default_service_config to google.protobuf.Struct #237
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The gRPC service config is based on a Protobuf message structure defined here:
https://github.com/grpc/grpc-proto/blob/master/grpc/service_config/service_config.proto
Ideally we'd just embed grpc.service_config.ServiceConfig into this message, but that's easier said than done. There is no canonical Go module containing the generated Protobuf source files.
Furthermore, grpc-go ships with some copies of those, but has them placed inside internal/. This means that even if we were to generate those ourselves, we'd run into a Protobuf registration conflict at runtime.
Use google.protobuf.Struct, so that we can at least embed these service configs without requiring excessive quoting.
This is a continuation of #236.