feat(tetris): implement Tetris environment

[MedAliMimouni]

This PR contains the implementation of the Tetris environment.
It contains the env implementations, the tests the rendering, except for the A2C networks.

[CLAassistant]

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2 out of 3 committers have signed the CLA.

✅ MedAliMimouni
✅ clement-bonnet
❌ med

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[clement-bonnet]

Thank you so much for your contribution. The environment looks very cool. I have left a few comments to improve the code. Please let me know if you have any questions.

[clement-bonnet]

LGTM

[clement-bonnet]

LGTM