[DataModel] Add an option to emit an input event when the value changes

[titouanmathis]

This can be useful to trigger other behaviors when working with forms. Another solution would be to emit a custom event on the DataBind component when the value changes, allowing us to react to it with the Action component.

<input type="text" 
  data-component="DataModel Action"
  data-option-on:custom-input="console.log('input has changed')"
  value="...">