✨ add landmark detection

[dyollb]

What do these changes do?

The PR adds

• landmark detection (monai) transforms
• a landmark detection network plus train/predict code

Related issue/s

• https://github.com/dyollb/segmantic/issues/48
• https://github.com/dyollb/segmantic/issues/49

How to test

Checklist

[codecov[bot]]

Codecov Report

Merging #47 (3979d6a) into main (6fd50b8) will increase coverage by 26.36%. The diff coverage is 75.18%.

@@             Coverage Diff             @@
##             main      #47       +/-   ##
===========================================
+ Coverage   22.84%   49.20%   +26.36%     
===========================================
  Files          47       20       -27     
  Lines        2530     1262     -1268     
  Branches      387      203      -184     
===========================================
+ Hits          578      621       +43     
+ Misses       1925      604     -1321     
- Partials       27       37       +10     

Flag	Coverage Δ
unittests	49.20% <75.18%> (+26.36%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/segmantic/seg/monai_unet.py	21.84% <25.00%> (ø)
src/segmantic/commands/monai_unet_cli.py	53.84% <40.00%> (+2.86%)	:arrow_up:
src/segmantic/util/config.py	59.09% <59.09%> (ø)
src/segmantic/detect/transforms.py	74.21% <74.21%> (ø)
src/segmantic/data/transforms.py	86.30% <86.30%> (ø)
src/segmantic/__init__.py	100.00% <100.00%> (ø)
src/segmantic/prepro/labels.py	88.88% <100.00%> (ø)
src/segmantic/seg/dataset.py	88.33% <100.00%> (ø)
src/segmantic/prepro/core.py	67.96% <0.00%> (-4.86%)	:arrow_down:

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