Convert frame to an uint8 numpy array

[thibo73800]

The following code should be available as a method of Frame instances, in order to convert the frame to numpy array in uint8 image format.

Code example

frame = frame.detach()
frame = frame.norm255()
frame = frame.cpu()
frame = frame.type(torch.uint8)
frame = frame.rename(None)
frame = frame.permute([1, 2, 0])
frame = frame.contiguous()
frame = frame.numpy()

[thibo73800]

This can be implement on top of as_numpy()