tracer: allow to skip span recording

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

tracer/options.go

@@ -85,6 +85,7 @@ func (sk SpanKind) String() string {
 type SpanOptions struct {
 	Labels []interface{}
 	Kind   SpanKind
+	Record bool
 }
 
 // SpanOption func signature
@@ -116,6 +117,12 @@ func WithSpanKind(k SpanKind) SpanOption {
 	}
 }
 
+func WithSpanRecord(b bool) SpanOption {
+	return func(o *SpanOptions) {
+		o.Record = b
+	}
+}
+
 // Options struct
 type Options struct {
 	// Context used to store custome tracer options