[Environments] Added Procgen environments

[ParamThakkar123]

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[vmoens]

Thanks for this! Great contribution!
Before merging we would need to:

• add the new classes to the doc (docs/source/reference)
• add tests in test_libs.py + a new workflow alongside the other ones

[ParamThakkar123]

@vmoens Okay on it! I will add those !

[ParamThakkar123]

I would also like to implement more environements and add dataset support after we get this merged !