--full-screen-resize does not preserve the aspect ratio

[mantiuk]

When resizing the video to match the screen size, if the video does not match the aspect ratio of the screen, it will be stretched:

ColorVideoVDP/pycvvdp/video_source_file.py

Line 269 in 52c528d

RGB = torch.nn.functional.interpolate(RGB.permute(2,0,1)[None],

The desired behaviour would be to adjust the target resolution so that the aspect ratio is preserved.