feat: Peg Solitaire env

[George-Ogden]

This merge request contains code for a new environment: peg solitaire

[carlosgmartin]

@George-Ogden What's the status of this PR? Anything I could help with?

[George-Ogden]

Hi @carlosgmartin Is there a plan to merge this? If so, I can rebase onto main

[carlosgmartin]

I guess @clement-bonnet or @sash-a needs to approve it?

[George-Ogden]

I've merged main and fixed the typing, linting and testing issues.

[clement-bonnet]

Hi @George-Ogden , thank you for the contribution! I think the last discussion led to questions about whether it was best for Solitaire to be integrated into Jumanji or somewhere else given its lack of initial state distribution and stochasticity. We are currently trying to wrap up Pacman, Sokoban, SlidingTilePuzzle, and FlatPack for the camera-ready version of the paper and the 0.4 release. Therefore, we will loop back on Solitaire after the release, and hope to get back to you soon 🙏