add basic benchmark for most processors

internal/processor/test/artnet-packet-encode_test.go

@@ -101,3 +101,26 @@ func TestBadArtnetPacketEncode(t *testing.T) {
 		})
 	}
 }
+
+func BenchmarkArtnetPacketEncode(b *testing.B) {
+	processorInstance := processor.ArtNetPacketEncode{}
+	payload := &artnet.ArtDmx{
+		ID:        []byte{'A', 'r', 't', '-', 'N', 'e', 't', 0x00},
+		OpCode:    artnet.OpDmx,
+		ProtVerHi: 0,
+		ProtVerLo: 14,
+		Sequence:  237,
+		Physical:  0,
+		SubUni:    1,
+		Net:       0,
+		Length:    512,
+		Data:      make([]uint8, 512),
+	}
+
+	for b.Loop() {
+		_, err := processorInstance.Process(b.Context(), common.WrappedPayload{Payload: payload})
+		if err != nil {
+			b.Fatalf("artnet.packet.encode processing failed: %s", err)
+		}
+	}
+}