feat(Client): validate token classification annotations in client

[frascuchon]

Closes #1579

This PR includes the changes implemented in #1611 with all conflicts resolved. @dcfidalgo we will merge this one so you don't need to resolve the conflicts.

[codecov]

Codecov Report

Base: 95.68% // Head: 95.66% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (06edaee) compared to base (96be2d4).
Patch coverage: 95.40% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1709      +/-   ##
==========================================
- Coverage   95.68%   95.66%   -0.02%     
==========================================
  Files         145      147       +2     
  Lines        6677     6720      +43     
==========================================
+ Hits         6389     6429      +40     
- Misses        288      291       +3     

Flag	Coverage Δ
pytest	95.66% <95.40%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/rubrix/client/models.py	93.78% <75.00%> (-4.80%)	⬇️
src/rubrix/__init__.py	100.00% <100.00%> (ø)
src/rubrix/client/datasets.py	97.66% <100.00%> (+0.01%)	⬆️
...brix/server/apis/v0/models/token_classification.py	100.00% <100.00%> (ø)
...ver/services/tasks/token_classification/metrics.py	100.00% <100.00%> (ø)
...erver/services/tasks/token_classification/model.py	99.00% <100.00%> (+0.89%)	⬆️
src/rubrix/utils/__init__.py	100.00% <100.00%> (ø)
src/rubrix/utils/span_utils.py	100.00% <100.00%> (ø)
src/rubrix/utils/utils.py	100.00% <100.00%> (ø)
...ubrix/labeling/text_classification/label_errors.py	90.36% <0.00%> (+3.61%)	⬆️

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