Add `events` package

[mjackson]

The events package (could also be called interaction) is for working with DOM and custom events in Remix UI. It provides a framework for:

• creating custom "interactions" (events with their own state, possibly multiple underlying event listeners)
• binding event listeners in Remix UI components

Since events in Remix are based on DOM events it should also work seamlessly with other frameworks that use the DOM including React, or just plain web components.