[v1.13] Remote federated search requests (experimental)

[Strift]

Following the changes related to Meilisearch v1.13.0 mega issue:

Description

Implement the experimental feature for remote federated search requests.

For further reference, see the related Meilisearch engine issue.

Specifications

• [ ] Add support for the new network API
• [ ] Update the multi-search functionality to accept the remote parameter