Cleans design of methods a bit

[vturrisi]

No description provided.

[codecov]

Codecov Report

Merging #238 (e5cdf44) into main (d5ac12d) will decrease coverage by 2.47%.
The diff coverage is 89.33%.

Flag	Coverage Δ		*Carryforward flag
cpu	83.43% <97.39%> (-0.14%)	⬇️
dali	39.15% <29.13%> (ø)		Carriedforward from d5ac12d

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
solo/methods/dali.py	83.47% <40.00%> (-7.52%)	⬇️
solo/utils/whitening.py	78.98% <50.00%> (-13.77%)	⬇️
solo/methods/linear.py	89.36% <76.92%> (+1.18%)	⬆️
solo/methods/base.py	77.68% <77.14%> (+0.76%)	⬆️
solo/methods/simclr.py	54.54% <78.57%> (+2.78%)	⬆️
solo/methods/byol.py	75.86% <84.37%> (-20.57%)	⬇️
solo/methods/nnbyol.py	69.23% <91.66%> (-0.24%)	⬇️
solo/args/utils.py	89.88% <100.00%> (ø)
solo/methods/barlow_twins.py	100.00% <100.00%> (ø)
solo/methods/deepclusterv2.py	87.34% <100.00%> (-8.55%)	⬇️
... and 30 more