RegisterServices registers implementations of each gRPC service and registers it with the server.

ServiceReady returns nil when the service is ready and a gRPC error when not.

StartWalletLoaderService creates an implementation of the WalletLoaderService and registers it with the gRPC server.

StartWalletService creates an implementation of the WalletService and registers it with the gRPC server.

UseLogger sets the logger to use for the gRPC server.