Support for new rive_native rendering engine

### Problem to solve

As per: https://github.com/rive-app/rive-flutter/issues/461#issuecomment-2963602685

`rive_native` appears to be the new rendering engine for flutter. It supports rendering functions that were missing previously. For example: Feathering is supported in `rive_native`.

Source: https://rive.app/docs/runtimes/flutter/rive-native#key-differences-between-rive-native-and-rive

### Proposal

Is there a plan to move to this in the future? Or should flame developers be working on a custom integration at this time?

### More information

_No response_

### Other

- [ ] Are you interested in working on a PR for this?