Record error and status for Otelsql when SQL returns an error

The Span ends early when SQL returns an error, which prevents Otelsql from recording the error and setting the status. This commit fixes this issue by deferring the Span.End() call.

otelsql/otel.go

@@ -101,7 +101,7 @@ func (t *dbInstrum) withSpan(
 		trace.WithSpanKind(trace.SpanKindClient),
 		trace.WithAttributes(attrs...))
 	err := fn(ctx, span)
-	span.End()
+	defer span.End()
 
 	if query != "" {
 		t.queryHistogram.Record(ctx, time.Since(startTime).Milliseconds(), metric.WithAttributes(t.attrs...))