feat: Add token count tracking

[rmitsch]

Description

Adds token count tracking.

Related Issues

• Resolve Add token logging + EcoLogits or similar #141

Changes Made

• Adds token count tracking.

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 86.06557% with 17 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sieves/model_wrappers/core.py	62.50%	6 Missing ⚠️
sieves/model_wrappers/outlines_.py	73.91%	6 Missing ⚠️
sieves/model_wrappers/dspy_.py	80.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
- Coverage   93.33%   93.10%   -0.23%     
==========================================
  Files          62       62              
  Lines        3450     3541      +91     
==========================================
+ Hits         3220     3297      +77     
- Misses        230      244      +14     

Files with missing lines	Coverage Δ
sieves/model_wrappers/gliner_.py	95.74% <100.00%> (+1.45%)	⬆️
sieves/model_wrappers/huggingface_.py	91.11% <100.00%> (+2.22%)	⬆️
sieves/model_wrappers/langchain_.py	89.13% <100.00%> (+1.63%)	⬆️
sieves/model_wrappers/types.py	100.00% <100.00%> (ø)
sieves/tasks/predictive/core.py	91.70% <100.00%> (+0.54%)	⬆️
sieves/model_wrappers/dspy_.py	84.81% <80.00%> (-1.86%)	⬇️
sieves/model_wrappers/core.py	90.41% <62.50%> (-6.26%)	⬇️
sieves/model_wrappers/outlines_.py	88.88% <73.91%> (-5.66%)	⬇️

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