[Model] CNN

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.89313% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 53.27%. Comparing base (e6afcf5) to head (138bcf0).

Files	Patch %	Lines
benchmarl/models/cnn.py	91.86%	7 Missing :warning:
test/test_models.py	97.61%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #74 +/- ## =========================================== - Coverage 89.99% 53.27% -36.72% =========================================== Files 69 70 +1 Lines 2739 2866 +127 =========================================== - Hits 2465 1527 -938 - Misses 274 1339 +1065 ```

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