remove flax dependency #90
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It feels like gymnax shouldn't depend on flax. After all, flax is a library for neural networks, which don't inherently have anything to do with reinforcement learning environments. The only thing flax is used for at the moment is for
flax.struct.dataclass. This PR migrates these to usechex.dataclassinstead, which also enables jax-supported dataclasses. It makes more sense to depend on chex than flax.