Issue #3252846 by hswong3i: Refine Gesture Handling Configure with Options

Currently we only support simple on/off for GestureHandling support, but
missing support for its configuration options (see
https://github.com/elmarquis/Leaflet.GestureHandling

), e.g.

    map.addControl(new L.Control.gestureHandling({
        duration: 1000,
        text: {
            touch: "Use two fingers to move the map",
            scroll: "Use ctrl + scroll to zoom the map",
            scrollMac: "Use \u2318 + scroll to zoom the map"
        },
    }));

This PR reference our Marker Cluster configuration form design, refine
GestureHandling configuration by provide a textarea for customize
options.

Signed-off-by: Wong Hoi Sing Edison <hswong3i@pantarei-design.com>