[WIP] Tabular dataset + Doc for testing the advantage of using DA techniques

[YanisLalou]

Issue #19

Dataset implemented: https://tableshift.org/datasets.html#childhood-lead

Still need to be done:

• For the plot_domain_adaptation_advantages.py:
  • Plots ?
  • Understand why score gap between with and without DA technique is so small
  • rename office31 fetch functions
  • Change doc depending on DA results

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (52b63b0) 88.54% compared to head (de9bfb8) 89.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #59      +/-   ##
==========================================
+ Coverage   88.54%   89.16%   +0.62%     
==========================================
  Files          41       43       +2     
  Lines        2601     2751     +150     
==========================================
+ Hits         2303     2453     +150     
  Misses        298      298              

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