Following this central issue

Explanation of the feature

Pass new search parameters to multiSearch method to get one single list of result
Ensure the queries passed can accept the federationOptions search parameter
No need to handle the case of errors, Meilisearch does it

Usage: https://meilisearch.notion.site/v1-10-federated-search-698dfe36ab6b4668b044f735fb40f0b2?pvs=74

TODO

• Add a new search parameter named federation to the multiSearch method
• Add the capability to have a new search parameter to the search query named federationOptions
• Add tests

⚠️ Please do 1 PR for all of these changes, and not several.