🐛 use monai DataLoader

[dyollb]

What do these changes do?

• use ITKWriter
• use monai.data.DataLoader instead of torch.utils.data.DataLoader
• fix mypy errors due to new versions of monai, etc.

Checklist

• [x] Non-breaking change (fix or new feature that would not break existing functionality).

[codecov[bot]]

Codecov Report

Merging #51 (5f725f0) into main (709f976) will increase coverage by 2.53%. The diff coverage is 26.66%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   20.30%   22.84%   +2.53%     
==========================================
  Files          47       47              
  Lines        2531     2530       -1     
  Branches      419      387      -32     
==========================================
+ Hits          514      578      +64     
+ Misses       1990     1925      -65     
  Partials       27       27              

Flag	Coverage Δ
unittests	22.84% <26.66%> (+2.53%)	:arrow_up:

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Impacted Files	Coverage Δ
.../segmantic/i2i/pix2pix_cyclegan/models/__init__.py	22.72% <25.00%> (ø)
src/segmantic/seg/monai_unet.py	21.84% <27.27%> (-0.24%)	:arrow_down:
.../segmantic/i2i/pix2pix_cyclegan/models/networks.py	14.68% <0.00%> (+14.68%)	:arrow_up:
...egmantic/i2i/pix2pix_cyclegan/models/base_model.py	22.40% <0.00%> (+22.39%)	:arrow_up:

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