Create github action to automatically benchmark a PR to dev

[sash-a]

Feature

Create github action to automatically benchmark a PR to develop. We could run a simple rware test and grab the final reward. We'd need to have a minimum reward we're aiming for and then we could always tell if a PR to main would impact performance.

[callumtilbury]

🙂🫳🕶️ 😎🤏