fix: use spacy entry points for missing factories

[percevalw]

Description

Fix following #235. Additionally, fixes #239

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:

Comparison is base (1faf768) 96.56% compared to head (f6cf871) 96.60%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #238 +/- ## ========================================== + Coverage 96.56% 96.60% +0.03% ========================================== Files 255 255 Lines 8387 8389 +2 ========================================== + Hits 8099 8104 +5 + Misses 288 285 -3 ```

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