Alligned `SearchRequest.Vector` type to `[]float32`

[structwafel]

Pull Request

Related issue

Fixes -

What does this PR do?

• Changes the type of SearchRequest.Vector to a []float32, as it aligns more with meilisearch and general embedding vectors.

PR checklist

Please check if your PR fulfills the following requirements:

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

Thank you so much for contributing to Meilisearch!

[codecov[bot]]

Codecov Report

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

Project coverage is 83.50%. Comparing base (cd67941) to head (74246b9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #524 +/- ## ======================================= Coverage 83.50% 83.50% ======================================= Files 10 10 Lines 1582 1582 ======================================= Hits 1321 1321 Misses 147 147 Partials 114 114 ```

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[meili-bors[bot]]

Build succeeded:

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