Feature image overlay

[andrewgryan]

Early design to add imageOverlay with the intention to easily extend this technique to all other L.* constructors.

Work in progress at the moment.

Summary by CodeRabbit

• New Features

  • Updated createLeafletObject function to include image overlay creation based on provided datasets.
  • Added new functions createL and changeL for handling Leaflet object creation and modification using HTML data attributes.
  • Added support for ImageOverlay attributes in Hyperleaflet, enabling easy creation with specific data attributes.

• Documentation

  • Detailed specifications for data-l, data-image-url, and data-image-bounds attributes provided in the usage documentation.
  • Event handling system in Hyperleaflet now supports map and geometries interaction with custom events sent to the window object.