[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 :warning:
benchmarl/algorithms/ippo.py	66.66%	1 Missing :warning:
benchmarl/algorithms/isac.py	66.66%	1 Missing :warning:
benchmarl/algorithms/maddpg.py	66.66%	1 Missing :warning:
benchmarl/algorithms/mappo.py	66.66%	1 Missing :warning:
benchmarl/algorithms/masac.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ 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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