Some transforms modules, pre and post transforms, update transforms config

[georgeyiasemis]

• Some transforms are now nn.Modules and can be implemented batch-wise
• MRI transforms split to pre-transforms and post-transforms. Plan is to call pre-transforms before collation and post-transforms after collation on device [not implemented yet, functionality now is as it was].
• Adding augmentation transforms: RandomFlip and RandomRotation
• Updates transforms configuration by flattening DictConfig from omegaconf

[codecov]

Codecov Report

Patch coverage: 87.61% and project coverage change: -0.01 ⚠️

Comparison is base (28d05d5) 83.88% compared to head (d596c08) 83.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
- Coverage   83.88%   83.87%   -0.01%     
==========================================
  Files          91       91              
  Lines        6136     6276     +140     
==========================================
+ Hits         5147     5264     +117     
- Misses        989     1012      +23     

Impacted Files	Coverage Δ
direct/data/mri_transforms.py	92.47% <83.85%> (-4.68%)	⬇️
direct/algorithms/mri_algorithms.py	100.00% <100.00%> (ø)
direct/data/datasets_config.py	100.00% <100.00%> (ø)
direct/train.py	56.93% <100.00%> (ø)
direct/types.py	84.37% <100.00%> (+1.04%)	⬆️
direct/utils/__init__.py	77.63% <100.00%> (+2.80%)	⬆️

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[jonasteuwen]

LGTM. Please immediately make an issue for black, and a PR.