Twin RHO Model Step 2: split the training set and train the twin model

[XianzheMa]

Per the title.

The major change is in file modyn/selector/internal/selector_strategies/downsampling_strategies/rho_loss_downsampling_strategy.py

[codecov]

Codecov Report

Attention: Patch coverage is 96.61017% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.98%. Comparing base (60d3baa) to head (3e9250a).

Files	Patch %	Lines
...ig/schema/pipeline/sampling/downsampling_config.py	66.66%	1 Missing ⚠️
...pling_strategies/rho_loss_downsampling_strategy.py	98.07%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #552      +/-   ##
==========================================
+ Coverage   82.93%   82.98%   +0.04%     
==========================================
  Files         221      221              
  Lines       10306    10342      +36     
==========================================
+ Hits         8547     8582      +35     
- Misses       1759     1760       +1     

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[github-actions]

^{( % to main)
( % to main)}

[MaxiBoether]

Will review when 547 is merged and the branch is updated

[MaxiBoether]

Thanks! No big comments, just a couple of nitpicky things

[MaxiBoether]

Thanks, on the Optional typing thing I had another comment but feel free to ignore that, it's minor...