feat: Provide confidence scores for all task results

[rmitsch]

Description

Adds confidence scores to results of all predictive tasks.

Related Issues

Resolves #245

Changes Made

• Adds confidence scores to all predictive tasks which didn't support them before

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

❌ Patch coverage is 87.50000% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ieves/tasks/predictive/relation_extraction/core.py	15.78%	16 Missing ⚠️
...es/tasks/predictive/information_extraction/core.py	54.54%	10 Missing ⚠️
sieves/tasks/predictive/sentiment_analysis/core.py	37.50%	5 Missing ⚠️
sieves/tasks/predictive/question_answering/core.py	85.71%	2 Missing ⚠️
...es/tasks/predictive/relation_extraction/bridges.py	92.00%	2 Missing ⚠️
sieves/tasks/predictive/utils.py	96.61%	2 Missing ⚠️
sieves/tasks/predictive/pii_masking/bridges.py	94.44%	1 Missing ⚠️
...ves/tasks/predictive/schemas/sentiment_analysis.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
- Coverage   93.26%   92.80%   -0.46%     
==========================================
  Files          77       78       +1     
  Lines        3918     4087     +169     
==========================================
+ Hits         3654     3793     +139     
- Misses        264      294      +30     

Files with missing lines	Coverage Δ
sieves/tasks/predictive/gliner_bridge.py	93.26% <100.00%> (+0.25%)	⬆️
...tasks/predictive/information_extraction/bridges.py	97.40% <100.00%> (+0.77%)	⬆️
sieves/tasks/predictive/ner/bridges.py	94.05% <100.00%> (+0.09%)	⬆️
sieves/tasks/predictive/ner/core.py	95.65% <ø> (ø)
sieves/tasks/predictive/pii_masking/__init__.py	100.00% <100.00%> (ø)
sieves/tasks/predictive/pii_masking/core.py	97.05% <100.00%> (ø)
...es/tasks/predictive/question_answering/__init__.py	100.00% <100.00%> (ø)
...ves/tasks/predictive/question_answering/bridges.py	98.46% <100.00%> (+0.15%)	⬆️
...s/tasks/predictive/relation_extraction/__init__.py	100.00% <100.00%> (ø)
sieves/tasks/predictive/schemas/ner.py	86.48% <100.00%> (+0.77%)	⬆️
... and 18 more

... and 2 files with indirect coverage changes

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