Add a way to enable per RPC logging

It looks something like

    // if opts.Logger != nil {
    //     loggerOpts := []logging.Option

Unknown macro: {     //         logging.WithLogOnEvents(logging.StartCall, logging.FinishCall),     //     }

    //     loggerDialOpts = []grpc.DialOption

Unknown macro: {     //         grpc.WithChainUnaryInterceptor(logging.UnaryClientInterceptor(interceptorLogger(opts.Logger), loggerOpts...)),     //         grpc.WithChainStreamInterceptor(logging.StreamClientInterceptor(interceptorLogger(opts.Logger), loggerOpts...)),     //     }

    // }

However because zap only has a max logging level of debug it'll cause a lot of spam so we need to work that bit out first.