excaliburjs / Excalibur / 8205665309

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fix: Handle webgl context lost + Recover from hidpi scale too large (#2958)

This PR addresses some issues with webgl contexts

- Fixed issue when WebGL context lost occurs where there was no friendly output to the user
- Fixed issue where HiDPI scaling could accidentally scale past the 4k mobile limit, if the context would scale too large it will now attempt to recover by backing off.
- Added way to add custom WebGL context lost/recovered handlers for your game
  ```typescript
  const game = new ex.Engine({
    handleContextLost: (e) => {...},
    handleContextRestored: (e) => {...}
  })
  ```

Default context lost screen 

![image](https://github.com/excaliburjs/Excalibur/assets/612071/92b20772-7ce9-4099-86aa-d174d561044e)

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