Missing event type KmlMouseEvent

[tichaelmurvey]

Please forgive any incorrect terminology as I am new to TS.

The KmlMouseEvent type is not associated with the onClick prop for the KmlLayer component, and is not defined elsewhere.
KmlLayer returns a KmlMouseEvent when clicked.

Here is the interface from the Google Maps API types:

 export interface KmlMouseEvent {
    /**
     * A <code>KmlFeatureData</code> object, containing information about the
     * clicked feature.
     */
    featureData: google.maps.KmlFeatureData | null;
    /**
     * The position at which to anchor an infowindow on the clicked feature.
     */
    latLng: google.maps.LatLng | null;
    /**
     * The offset to apply to an infowindow anchored on the clicked feature.
     */
    pixelOffset: google.maps.Size | null;
  }

[JustFly1984]

Please provide a PR and I will merge