[Feature] Optional Tanh transfromed distributions in algorithms

[matteobettini]

Added the possibility of choosing if continuous actions distributions should be Tanh trnasformed

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (02fc1b6) 89.68% compared to head (76acbc7) 46.47%.

Files	Patch %	Lines
benchmarl/algorithms/iddpg.py	66.66%	1 Missing ⚠️
benchmarl/algorithms/ippo.py	66.66%	1 Missing ⚠️
benchmarl/algorithms/isac.py	66.66%	1 Missing ⚠️
benchmarl/algorithms/maddpg.py	66.66%	1 Missing ⚠️
benchmarl/algorithms/mappo.py	66.66%	1 Missing ⚠️
benchmarl/algorithms/masac.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #45       +/-   ##
===========================================
- Coverage   89.68%   46.47%   -43.21%     
===========================================
  Files          64       64               
  Lines        2656     2668       +12     
===========================================
- Hits         2382     1240     -1142     
- Misses        274     1428     +1154     

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