MNT: Unpin dependencies and refactor packaging

[fepegar]

Unpinning dependencies so the library can be easily used by other libraries.

Also, refactoring packaging to more modern Python standards.

TODO:

• Update docs to point to specific tag/branch/version for BioViL reproducibility

[codecov]

Codecov Report

Merging #770 (03156e1) into main (ed8886d) will decrease coverage by 0.26%.
The diff coverage is n/a.

❗ Current head 03156e1 differs from pull request most recent head 6e4b68f. Consider uploading reports for the commit 6e4b68f to get more accurate results

Flag	Coverage Δ
hi-ml-multimodal	86.84% <ø> (-0.09%)	⬇️

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

Impacted Files	Coverage Δ
...path/src/health_cpath/utils/analysis_plot_utils.py	30.55% <0.00%> (-4.17%)	⬇️
hi-ml-cpath/src/health_cpath/models/transforms.py	78.26% <0.00%> (-2.93%)	⬇️
...ml-cpath/src/health_cpath/datasets/base_dataset.py	84.49% <0.00%> (-2.33%)	⬇️
hi-ml-azure/src/health_azure/himl.py	25.07% <0.00%> (-1.95%)	⬇️
hi-ml/src/health_ml/runner.py	83.67% <0.00%> (-1.05%)	⬇️
hi-ml-cpath/src/health_cpath/utils/plots_utils.py	80.70% <0.00%> (-0.87%)	⬇️
hi-ml-cpath/src/health_cpath/utils/viz_utils.py	86.46% <0.00%> (-0.53%)	⬇️
...src/health_cpath/configs/classification/BaseMIL.py	84.09% <0.00%> (-0.47%)	⬇️
hi-ml-cpath/src/health_cpath/utils/output_utils.py	74.35% <0.00%> (-0.39%)	⬇️
...timodal/src/health_multimodal/image/model/model.py	93.16% <0.00%> (-0.23%)	⬇️
... and 19 more