Sinter custom sampler

[inmzhang]

Fixes #682

This issue is related to one of my projects, so I attempted a basic and quick solution. I followed the pattern of sinter.Decoder and the implementation between the two should be similar.

The sampler has been poorly tested, and there may still be some issues with backward compatibility. However, I would appreciate your initial thoughts, as I'm not sure if this aligns with your design for this issue.