Fix type issues with multiSearch

[flevi29]

Pull Request

Related issue

Fixes #1767

Caution

BREAKING: new function federatedMultiSearch, TypeScript requires this function to be used when using federation, but otherwise it's identical to multiSearch

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.21%. Comparing base (896b5c0) to head (9f93f90).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1793   +/-   ##
=======================================
  Coverage   98.20%   98.21%           
=======================================
  Files          18       18           
  Lines        1562     1568    +6     
  Branches      333      335    +2     
=======================================
+ Hits         1534     1540    +6     
  Misses         28       28           

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