feat: add our I2B2 to OMOP converter

[Vincent-Maladiere]

Description

Add I2B2 converter methods from EDSTeva with small revamps. The get_i2b2_table method is used by HiveData during table fetching to perform table and column renaming, along with some value changes.
I need to test it on our I2B2 data.

TODO:

• Test with our I2B2 extract. First, manually on a single table, then extend the analysis and find areas we don't cover yet. Ideally, we'll have a script to quantify the discrepancies.
• We need to document it. We want this feature to be user-facing, so we'll need thorough documentation, examples, and contributing guidelines.
• How to write tests on that? Maybe running the script manually at first?

Checklist

• If this PR is a bug fix, the bug is documented in the test suite.
• Changes were documented in the changelog (pending section).
• If necessary, changes were made to the documentation (eg new pipeline).

[codecov-commenter]

Codecov Report

Base: 94.95% // Head: 92.54% // Decreases project coverage by -2.40% ⚠️

Coverage data is based on head (b4b8f58) compared to base (e75d7fc).
Patch coverage: 22.38% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   94.95%   92.54%   -2.41%     
==========================================
  Files          63       64       +1     
  Lines        1963     2026      +63     
==========================================
+ Hits         1864     1875      +11     
- Misses         99      151      +52     

Impacted Files	Coverage Δ
eds_scikit/io/i2b2_mapping.py	13.33% <13.33%> (ø)
eds_scikit/io/hive.py	100.00% <100.00%> (ø)
eds_scikit/io/settings.py	100.00% <100.00%> (ø)
eds_scikit/emergency/emergency_care_site.py	90.00% <0.00%> (-0.33%)	⬇️
eds_scikit/icu/icu_care_site.py	100.00% <0.00%> (ø)
eds_scikit/structures/description.py	100.00% <0.00%> (ø)
eds_scikit/emergency/emergency_visit.py	100.00% <0.00%> (ø)

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[Vincent-Maladiere]

Pushing it now to master to ease testing on k8