[WIP] Test time API for shallow method

[tgnassou]

The goal of this PR is to propose a API for test time method.

the test time method will break if the new domain has never be seen but the model, and will raise a error to update the model with fit_new_domain. To work with pipeline, one can enable auto_fit_new_domain. With this on, it will automatically refit for new unseen domain.

@rflamary if you want to check!

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.53%. Comparing base (46bc3db) to head (9a56488).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
+ Coverage   95.92%   96.53%   +0.61%     
==========================================
  Files          66       53      -13     
  Lines        7236     6261     -975     
==========================================
- Hits         6941     6044     -897     
+ Misses        295      217      -78     

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[tgnassou]

@rflamary If you want to check if it was something like that that you imagined for test time DA

[tgnassou]

@rflamary Maybe it is the time to revive this PR ? WDYT ?