Add Meilisearch v1.18.0 support

[psylone]

Pull Request

Related issue

Fixes #650

What does this PR do?

• Add index rename docs and specs
• Support index renaming via swap_indexes
• Add spec for retrieve_vectors search parameter

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?

Summary by CodeRabbit

Release Notes

• New Features

  • Added support for retrieving vectors in search results using the retrieve_vectors parameter
  • Enhanced index swap functionality for more flexible index operations

• Documentation

  • Clarified that index updates can now rename the index UID and/or update the primary key
  • Added code examples demonstrating index renaming and vector retrieval in search operations

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