Stop symbol animation at the end of polyline

Currently animation symbol overlay animates for infinite time in given polyline.
[Link to page](https://developers.google.com/maps/documentation/javascript/examples/overlay-symbol-animate)

Solution/Suggestion :

Maybe we could add 2 buttons at top `start animation` and `stop animation`. Such that if we want to stop animating symbol at the end of polyline we can click on stop animation

Buttons could look like: [drop marker button](https://developers.google.com/maps/documentation/javascript/examples/marker-animations-iteration)