Update EnvSpec to improve backward compatibility
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Recreated from original PR: Farama-Foundation/Gymnasium#355
Description
As noted by DLR-RM/stable-baselines3#1327 (comment), there are significant backward compatibility issues with Farama-Foundation/Gymnasium#292
This PR updates
EnvSpecsuch that it is a "full description of the whole env". Using theEnvSpecinmakeis now identical tomake(str)as before. Critically, the difference withmakein v0.27 is that theEnvSpecchanges with each wrapper applied, including the def...