Add checkpoint/restore support

[ChengyuZhu6]

What is the problem you're trying to solve

Add docker-like container checkpoint and restore capabilities to nerdctl, enabling users to snapshot the state of a running container and restore it on the same or another host.

Describe the solution you'd like

CLI:

• nerdctl checkpoint create: checkpoint: support checkpoint create command #4484
• nerdctl checkpoint ls: checkpoint: support checkpoint ls command #4515
• nerdctl checkpoint rm: checkpoint: support checkpoint rm command #4562
• nerdctl start --checkpoint|--checkpoint-dir: checkpoint: support checkpoint create command #4484

Additional context

No response

[ChengyuZhu6]

I'd like to take it