[v1.3] Display hits ranking scores

[brunoocasali]

⚠️ This issue is generated, it means the examples and the namings do not necessarily correspond to the language of this repository.
Also, if you are a maintainer, please add any clarification and instructions about this issue.

I'm sorry if this is already entirely implemented. Feel free to let me know about the state of this issue in the repo.

Related to meilisearch/integration-guides#280

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New implementation

Related to:

• issue: Display ranking details at search meilisearch/meilisearch#3771
• discussion: Return the output of the ranking rules for each search result meilisearch/product#594
• spec: Score details meilisearch/specifications#252

This feature aims to return ranking details for each document to understand and tweak the score of the documents more efficiently.

Ensure the SDKs can handle the new search parameter showRankingScore. Also, ensure the SDK can handle the _rankingScore attribute in the matched hits.

TODO:

• Add the ability receive a new param in the search method called showRankingScore.
• Add the ability handle the new _rankingScore key/value in the search hits' response.
• Add integration tests