Display the size of a an array or object when returning results

[Barabasbalazs]

Pull Request

Related issue

Fixes #https://github.com/meilisearch/mini-dashboard/issues/548

What does this PR do?

• Displays the number of elements in an array and the number of top level items in a JSON

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

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