Add sizes to traces (#19851)

added to storage and grid traces. Can provide more context for traces that aren't HTTP. Others may apply.

internal/grid/trace.go

@@ -105,6 +105,7 @@ func (c *muxClient) traceRoundtrip(ctx context.Context, t *tracer, h HandlerID,
 		Duration:  end.Sub(start),
 		Path:      t.Subroute,
 		Error:     errString,
+		Bytes:     int64(len(req) + len(resp)),
 		HTTP: &madmin.TraceHTTPStats{
 			ReqInfo: madmin.TraceRequestInfo{
 				Time:    start,