feat: Implement SemScore metric

[carlosgjs]

• Implementation of SemScore metric: https://arxiv.org/pdf/2401.17072.pdf
• Renaming the train optional dependency group to pipelines since those dependencies are used across all the pipelines (training, evaluation).

Part of #30

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2a26151) 97.87% compared to head (1e2ce17) 98.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #38 +/- ## ========================================== + Coverage 97.87% 98.00% +0.12% ========================================== Files 6 6 Lines 235 250 +15 ========================================== + Hits 230 245 +15 Misses 5 5 ```

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