✨ Add zero shot relations extraction

[GabrielePicco]

Add zero shot relations extraction

Status	Type	⚠️ Core Change	Issue
Hold	Feature	Yes

Description

• Extend the current framework to add zero shot RE capabilities
• Add a new RE visualisation in zshot displacy to render entities and relations

Other changes (e.g. bug fixes, small refactors)

• Refactor the evaluation pipeline

[codecov]

Codecov Report

Base: 91.69% // Head: 92.14% // Increases project coverage by +0.45% 🎉

Coverage data is based on head (5d4eba8) compared to base (ee170c6).
Patch coverage: 91.81% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   91.69%   92.14%   +0.45%     
==========================================
  Files          53       67      +14     
  Lines        2024     2726     +702     
==========================================
+ Hits         1856     2512     +656     
- Misses        168      214      +46     

Impacted Files	Coverage Δ
zshot/utils/alignment_utils.py	100.00% <ø> (ø)
zshot/utils/data_models/span.py	91.30% <75.00%> (+6.30%)	⬆️
zshot/relation_extractor/relations_extractor.py	75.51% <75.51%> (ø)
zshot/utils/displacy/displacy.py	75.51% <75.51%> (ø)
...hot/relation_extractor/zsrc/zero_shot_rel_class.py	79.62% <79.62%> (ø)
zshot/utils/data_models/relation_span.py	85.71% <85.71%> (ø)
zshot/evaluation/dataset/fewrel/fewrel.py	92.85% <92.85%> (ø)
zshot/tests/utils/test_displacy.py	93.10% <93.10%> (ø)
zshot/utils/displacy/relations_render.py	95.16% <95.16%> (ø)
zshot/relation_extractor/zsrc/data_helper.py	97.22% <97.22%> (ø)
... and 23 more

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