Allow usage of native onMouseDown, onMouseUp, onMouseHover, onKeyDown, onKeyUp events

[marcofugaro]

Close #120, Close #127, Close #127

This PR changes the names of the Spline event listeners, allowing users to use the native onMouseDown, onMouseUp, onMouseHover, onKeyDown, onKeyUp events. Before these listeners were hijacked by Spline for usage with the Spline Events.

Before

export default function App() {
  function onMouseDown(e) {
    if (e.target.name === 'Cube') {
      console.log('I have been clicked!');
    }
  }

  return (
    <Spline
      scene="https://prod.spline.design/6Wq1Q7YGyM-iab9i/scene.splinecode"
      onMouseDown={onMouseDown}
    />
  );
}

After

export default function App() {
  function onSplineMouseDown(e) {
    if (e.target.name === 'Cube') {
      console.log('I have been clicked!');
    }
  }

  return (
    <Spline
      scene="https://prod.spline.design/6Wq1Q7YGyM-iab9i/scene.splinecode"
      onSplineMouseDown={onSplineMouseDown}
    />
  );
}

[lorenzrabs]

The exported code from spline is still using v3.1. Maybe create a notice on the docs to save someone else's time..