Support Gym MultiDiscrete MultiBinary

[wduguay-air]

Changes

• Added support for gym spaces of type MultiDiscrete and MultiBinary
• Test serialization case with all possibilities.
• Upgrade hydra version

[cloderic]

The python side looks good, can you do the js side at the same time in https://github.com/cogment/cogment-verse/blob/main/cogment_verse/web/web_app/src/utils/spaceSerialization.js ?

[cloderic]

looks good to me 👍