AllMethodsForServer returns a slice that contains the method descriptors for all methods exposed by the given gRPC server.

AllMethodsForServices returns a slice that contains the method descriptors for all methods in the given services.

AllMethodsViaInProcess returns a slice that contains the method descriptors for all methods exposed by the given server.

TODO breadchris make this more generic to allow different type of descriptors such as MessageDescriptor.

TODO breadchris maybe a better name is type serializer?.

TODO breadchris placeholder until the above is implemented.