add code coverage

[ahmednfwela]

Pull Request

Related issue

Fixes #347

What does this PR do?

• Adds code coverage

PR checklist

Please check if your PR fulfills the following requirements:

• [ ] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• [ ] Have you read the contributing guidelines?
• [ ] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@153ae7e). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #348 +/- ## ======================================= Coverage ? 82.75% ======================================= Files ? 48 Lines ? 1212 Branches ? 0 ======================================= Hits ? 1003 Misses ? 209 Partials ? 0 ```

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[meili-bors[bot]]

Build succeeded:

• integration-tests (dart 3.0.0)
• linter-check
• pana