polyPathChange event is missing in Polyline

[ziXet]

Hi,

Thanks for maintainig this library.

We have noticed that this event is missing in the Polyline.

It used to be in the agm-map. https://angular-maps.com/api-docs/agm-core/directives/agmpolyline#source

    this._polylineManager.createPathEventObservable(this).then((ob$) => {
      const os = ob$.subscribe(pathEvent => this.polyPathChange.emit(pathEvent));
      this._subscriptions.push(os);
    });

Any possibility of adding this? or a workaround?

The use-case is when the line is editable, user drags the points and we need to get an event to get the new path.

Thanks

[DaSchTour]

@ziXet can you check the PR #183 if that's how it should work?