Enum duplication in proto file

[Helius01]

In code first i faced an issue after calling this route : /grpc.reflection.v1alpha.ServerReflection/ServerReflectionInfo

The Enum types generates per usage in schema not once and it interrupts the behavior of that endpoint, so you can't use some communicate tools like Postman and ...

[erichiller]

This is related to #323 - I added a workaround there as well for the auto-generated ZERO values, but the same workaround could easily be modified to rename the gRPC enum field names.