feat: pass config env kwargs to gymnax via envparams

[emergenz]

In gymnax, environment parameters should be modified using EnvParams. In fact, currently a non-empty config.env.kwargs errors when used with gymnax.

[EdanToledo]

This is great, the only problem is that some environments do take init args that are not in the envparams. For example, minatar breakout. We would need to handle this as well somehow.

[emergenz]

Hm, I see. Then maybe for now we need to hard-code for which gymnax envs to use EnvParams, and for which to use kwargs. We can't just do both since using kwargs when EnvParams should be used leads to an error due to the init method of those environments not taking any additional arguments.

[EdanToledo]

I'm sure there is an easy way to do it step by step and populate the env init kwargs first and then the env Params with the remainder.

[emergenz]

Feel free to commit over this PR

[EdanToledo]

I've made the fix, once tests pass and im back at my pc ill merge.