v0.3: UpkieWheelsEnv example

[stephane-caron]

This release introduces an examples/ folder with a simple Python example for the UpkieWheelsEnv environment.

Added

• Add upkie_locomotion.envs.register function
• PPO balancer: setting for total number of training timesteps
• UpkieWheelsEnv: simple example

Changed

• UpkieWheelsEnv: remove dependency on gin

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This discussion was created from the release v0.3.0.