[Feat] Create template environment similar to Gymnasium's

[David-GERARD]

Proposal

As of now, the PettingZoo documentation gives instructions on how to create a custom environment. However, Gymnasium uses copier to clone a template environment which is better.

The goal of this proposal is to implement a template PettingZoo environment and create documentation to use it, like with Gymnasium.

Motivation

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Pitch

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Alternatives

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Additional context

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Checklist

• I have checked that there is no similar issue in the repo