[Feature] Choose if evaluation is run on sampled actions or on mode

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (56e1b09) 84.48% compared to head (b795c81) 46.49%.

Files	Patch %	Lines
benchmarl/experiment/experiment.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #49 +/- ## =========================================== - Coverage 84.48% 46.49% -37.99% =========================================== Files 64 64 Lines 2668 2669 +1 =========================================== - Hits 2254 1241 -1013 - Misses 414 1428 +1014 ```

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