feat: prepare_for_training supports spacy

[frascuchon]

This PR brings the works started by @ignacioct in #1584 adding support to spaCy for the prepare_for_training method.

Refs #420 and #1584

[codecov]

Codecov Report

Merging #1635 (41559c0) into master (076ab06) will decrease coverage by 0.15%.
The diff coverage is 88.37%.

@@            Coverage Diff             @@
##           master    #1635      +/-   ##
==========================================
- Coverage   95.36%   95.20%   -0.16%     
==========================================
  Files         135      135              
  Lines        6444     6502      +58     
==========================================
+ Hits         6145     6190      +45     
- Misses        299      312      +13     

Flag	Coverage Δ
pytest	95.20% <88.37%> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
src/rubrix/client/datasets.py	96.91% <88.37%> (-1.08%)	⬇️
...ubrix/labeling/text_classification/label_errors.py	86.74% <0.00%> (-3.62%)	⬇️
src/rubrix/listeners/listener.py	91.20% <0.00%> (-3.30%)	⬇️
src/rubrix/listeners/models.py	100.00% <0.00%> (ø)

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[dcfidalgo]

💯 Added a few inline suggestions.