Add url to open ai embedder

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (492da51) to head (0743399).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## meilisearch-v1.10.0 #1026 +/- ## ===================================================== Coverage 100.00% 100.00% ===================================================== Files 20 20 Lines 2906 2907 +1 ===================================================== + Hits 2906 2907 +1 ```

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