feat: allow for customizing markers with drawPoints

[thaddmt]

Description of changes

• Added options in drawPoints for markerImageElement and activeMarkerImageElement so customers can pass their own custom icons in
• Added examples, updated docs
• Added unit tests

Code Snippet

import myIcon from "./spiderman.svg"
...
     const icon = new Image(100, 100);
      icon.src = myIcon;

      map.on("load", function () {

        const output = drawPoints(
          'mySourceName',
          [
            {
              coordinates: [-122.483696, 37.833818],
              title: 'Golden Gate Bridge',
              address: 'A suspension bridge spanning the Golden Gate',
            },
            {
              coordinates: [-122.477, 37.8105],
            },
          ],
          map,
          {
            unclusteredOptions: {
              markerImageElement: icon,
              activeMarkerImageElement: icon
            }
          }
        );

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are [changed or added]
• Relevant documentation is changed or added (and PR referenced)

[github-actions]

🎉 This PR is included in version 1.3.0-ci-test.1 🎉

The release is available on:

• npm package (@ci-test dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 1.3.0-unstable.1 🎉

The release is available on:

• npm package (@unstable dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 1.3.0-geo.1 🎉

The release is available on:

• npm package (@geo dist-tag)
• GitHub release

Your semantic-release bot 📦🚀