### 馃殌 Feature [Feature Request] Implement checkpoint for selfplay ### Motivation _No response_ ### Additional context _No response_ ### Checklist - [X] I have checked that there is no similar [issues](https://github.com/OpenRL-Lab/openrl/issues) in the repo - [X] I have read the [documentation](https://openrl-docs.readthedocs.io/)
馃殌 Feature
[Feature Request] Implement checkpoint for selfplay
Motivation
No response
Additional context
No response
Checklist