Better env configuration

[theOGognf]

Having a separate class for environment configuration is a bit verbose. This can probably be slimmed down by just passing args directly to the environment instead of a dictionary. Although, I'm not sure if RLlib supports those environments.

[theOGognf]

At least instantiating the configs from a dict can be done with pydantic or dacite. Probably can't get around defining configs separately.

[theOGognf]

Switched to using pydantic. Given the current nature of the wrappers, the configuration detail is fine.