Rework to ESM + Playwright tests

[wilsonge]

• This reworks the module onto ESM javascript
• Adds tests based on playwright so that tests run in a real browser scenario and can use 'real' simulated click and drag events rather than artificial ones.
• Increases the browser version requirements to that in the package.json (currently > 0.5%, last 2 versions, not dead) - i.e. Internet Explorer support is dropped

Theres still more parts of the code that can be cleaned up now IE support is removed but this is an initial first pass to see if your interested in using this for a new major version of the library.