Create retrievers and entrypoint scripts

[tonywu71]

Features

• Implement all retrievers from the ColPali paper
• Clean the interpretability code
• Implement entrypoint scripts

[tonywu71]

@HuguesSib Here's a checklist for you:

• [ ] Are all the PyTorch model calls wrapped in with torch.no_grad():?
• [ ] Are all lines where you assign tensors to variables commented with their respective shape?

For the rest, looks good to me! 👌🏼