[Feature] Local seed

[matteobettini]

Calling vmas.seed(0) won't affect the seeds (torch, numpy, python) outside the library.

VIce versa, calling torch.manual_seed(0) outside vmas won't affect the seed inside the library

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.13%. Comparing base (06f29d4) to head (6e76e55).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
vmas/simulator/environment/environment.py	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   87.09%   87.13%   +0.04%     
==========================================
  Files          93       93              
  Lines       10411    10462      +51     
==========================================
+ Hits         9067     9116      +49     
- Misses       1344     1346       +2     

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