[Meilisearch v1.47.0] Add personalized search (experimental)

[Strift]

Context

Meilisearch 1.47.0 adds full support for personalized search (experimental) to the search endpoint.

NB: before 1.47.0, federated search requests did not support personalized search.

Objective

Update the SDK to support personalized search on the search endpoint.

Update the corresponding SDK methods

• Search (POST)
• Search (GET)

Both related API endpoints now accept a new personalize object parameter:

{
  // other request parameters...
  "personalize": {
    "userContext": "The user prefers ..."
  }
}

Tasks

• Add/update methods to handle interacting with the search API endpoints
• Add/update test cases for the new/updated methods
• No code samples to update

[GabrielBBaldez]

I'd like to take this one. I'll open a PR shortly.