chore: Change classification multi_label: bool to mode: Literal["multi", "single"]

[rmitsch]

Description

Changes classification multi_label: bool to mode: Literal["multi", "single"] to align with other tasks (i.e. InformationExtraction).

Related Issues

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Changes Made

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Checklist

• Tests have been extended to cover changes in functionality
• Existing and new tests succeed
• Documentation updated (if applicable)
• Related issues linked

Screenshots/Examples (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   93.26%   93.26%           
=======================================
  Files          77       77           
  Lines        3918     3918           
=======================================
  Hits         3654     3654           
  Misses        264      264           

Files with missing lines	Coverage Δ
sieves/model_wrappers/huggingface_.py	91.11% <ø> (ø)
sieves/tasks/predictive/classification/bridges.py	94.40% <100.00%> (ø)
sieves/tasks/predictive/classification/core.py	96.64% <100.00%> (ø)
sieves/tasks/predictive/gliner_bridge.py	93.01% <100.00%> (ø)

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