simplify the existing environments by using the default processes of sb3

[ll7]

Use the insights of https://github.com/ll7/understanding_deep_RL/blob/66a5e6943e4fd7466ad3d7638ae951c10cb8dcc2/wandb_tests/wandb_car_racing_sweep.py#L151-L181 to simplify

robot_sf_ll7/robot_sf/sensor/sensor_fusion.py

Lines 17 to 22 in 4e61510

	def fused_sensor_space(
	timesteps: int,
	robot_obs: spaces.Box,
	target_obs: spaces.Box,
	lidar_obs: spaces.Box
	) -> Tuple[spaces.Dict, spaces.Dict]:

This could help to fix some of the issues in #12 and #11

[ll7]

https://gymnasium.farama.org/ as starting point.

https://gymnasium.farama.org/api/env/ as explicit draft.

[ll7]

I will do this tutorial first https://gymnasium.farama.org/tutorials/gymnasium_basics/environment_creation/