add invoking onValueChangeFinished on tap

Author: gsrocks-lanars

slider/src/main/java/com/smarttoolfactory/slider/ColorfulSlider.kt

@@ -248,6 +248,7 @@ fun ColorfulSlider(
                             scaleToUserValue(offsetInTrack),
                             Offset(rawOffset.value.coerceIn(trackStart, trackEnd), strokeRadius)
                         )
+                        onValueChangeFinished?.invoke()
                     }
                 }
             }