add metadata option for recorder

recorder/recorder.go

@@ -4,9 +4,18 @@ import (
 	"context"
 )
 
-type RecordOptions struct{}
+type RecordOptions struct {
+	Metadata any
+}
+
 type RecordOption func(opts *RecordOptions)
 
+func MetadataReocrdOption(md any) RecordOption {
+	return func(opts *RecordOptions) {
+		opts.Metadata = md
+	}
+}
+
 type Recorder interface {
 	Record(ctx context.Context, b []byte, opts ...RecordOption) error
 }