[WIP][camera_android_camerax] Force new Surface for each SurfaceRequest

[camsim99]

Note

This is a proof of concept for the SurfaceProducer.invalidateSurface method I am considering implementing to fix flutter/flutter#155294.

Since timing for Surface requests cannot be guaranteed, request a new Surface from SurfaceProducer.getSurface each time a Surface is requested for rendering the camera preview to.

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