feat: Unified predictive task result schemas

[rmitsch]

Description

Unifies predictive task result schemas across bridges.

Related Issues

• Resolves Unify task output types #240

Changes Made

• Unifies result schemas across bridges for predictive tasks
• Introduce schemas modules in task modules to hold (most) schemas
• Updates test suite accordingly
• Updates docs accordingly
• Include a cached flag in doc-task metadata to indicate whether a doc has been served from cache
• Fixes a bug in Outlines token counting for transformers models

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 93.28358% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sieves/tasks/predictive/gliner_bridge.py	91.92%	13 Missing ⚠️
sieves/tasks/predictive/ner/schemas.py	85.29%	5 Missing ⚠️
sieves/tasks/predictive/classification/bridges.py	75.00%	4 Missing ⚠️
sieves/tasks/predictive/classification/schemas.py	92.30%	3 Missing ⚠️
...tasks/predictive/information_extraction/schemas.py	92.59%	2 Missing ⚠️
...ves/tasks/predictive/sentiment_analysis/schemas.py	91.66%	2 Missing ⚠️
sieves/tasks/predictive/summarization/bridges.py	71.42%	2 Missing ⚠️
sieves/tasks/predictive/translation/bridges.py	71.42%	2 Missing ⚠️
sieves/tasks/predictive/ner/bridges.py	75.00%	1 Missing ⚠️
sieves/tasks/predictive/pii_masking/schemas.py	95.65%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
+ Coverage   93.21%   93.34%   +0.12%     
==========================================
  Files          62       72      +10     
  Lines        3554     3681     +127     
==========================================
+ Hits         3313     3436     +123     
- Misses        241      245       +4     

Files with missing lines	Coverage Δ
sieves/model_wrappers/core.py	90.78% <100.00%> (+0.37%)	⬆️
sieves/model_wrappers/outlines_.py	88.88% <100.00%> (ø)
sieves/pipeline/core.py	93.54% <100.00%> (+0.10%)	⬆️
sieves/tasks/predictive/__init__.py	100.00% <100.00%> (ø)
sieves/tasks/predictive/bridges.py	100.00% <100.00%> (+7.69%)	⬆️
sieves/tasks/predictive/classification/__init__.py	100.00% <100.00%> (ø)
sieves/tasks/predictive/classification/core.py	96.64% <100.00%> (+1.35%)	⬆️
sieves/tasks/predictive/core.py	91.37% <100.00%> (-0.34%)	⬇️
...asks/predictive/information_extraction/__init__.py	100.00% <100.00%> (ø)
...tasks/predictive/information_extraction/bridges.py	96.62% <100.00%> (+0.01%)	⬆️
... and 30 more

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