Refacto span classification

[percevalw]

Description

Changed

• :warning: Breaking change. Improved and simplified eds.span_qualifier: we didn't support combination groups before, so this feature was scrapped for now. We now also support splitting values of a single qualifier between different span labels.

Fixed

• Allow span pooler to choose between multiple base embedding spans (as likely produced by eds.transformer) by sorting them by Dice overlap score.

Checklist

• [x] If this PR is a bug fix, the bug is documented in the test suite.
• [x] Changes were documented in the changelog (pending section).
• [x] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

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

Project coverage is 97.29%. Comparing base (35c3b01) to head (1cecb42).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #276 +/- ## ========================================== + Coverage 97.13% 97.29% +0.15% ========================================== Files 257 257 Lines 8734 8753 +19 ========================================== + Hits 8484 8516 +32 + Misses 250 237 -13 ```

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