Default dtype and device to SB environment

[bqth29]

💬 Pull Request Description

The get/set/reset_env functions have been moved to their own file named environment.py and all the dtype and device occurences in methods signatures have been made optional with a default value to None.

✔️ Check list

• The code matches the styling rules
• The new code is covered by relevant tests
• Documentation was added

🚀 New features

None

🐞 Bug fixes

None

📣 Supplementary information

The configure default values for the tensors' dtype and device, it is recommanded to ather use PyTorch's torch.set_default_dtype and torch.set_default_device functions.

We considered the possibility of configuring these values via the SB environment directly, but this would risk creating a mismatch between the information stored in the environment and the actual default value, should a call be made to one of PyTorch's functions in the meantime.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (775cc10) 100.00% compared to head (9885b97) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #38   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           38        40    +2     
  Lines         1460      1484   +24     
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+ Hits          1460      1484   +24     

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