Gym naming convetion

[qgallouedec]

I recommend keeping the initial naming for two reasons:

• it matches the gymnasium convention for environment id (pascal case)
• having lowcostrobot as a prefix is somewhat the same as the namespace, which is already supported by the gym register (https://gymnasium.farama.org/api/registry/#gymnasium.register): gym.make("gym_lowcostrobot/LiftCube-v0")

[perezjln]

I agree, thanks very much Quentin for the wise suggestion.