`multi_search_federated_1` code sample missing from most integrations

There's a multi_search_federated_1 code sample:
Live website: https://www.meilisearch.com/docs/reference/api/multi_search#federated-multi-search
meilisearch-js: https://github.com/meilisearch/meilisearch-js/blob/489b58351c568e30a6c336d6e8bc9a603f17543d/.code-samples.meilisearch.yaml#L784

multi_search_federated_1: |-
  client.multiSearch({
    federation: {},
    queries: [
      {
        indexUid: 'movies',
        q: 'batman',
      },
      {
        indexUid: 'comics',
        q: 'batman',
      },
    ]
  })

It seems to be only implemented in js and php, likely because instructions to add it were missing from the issues created from #302 (see https://github.com/meilisearch/meilisearch-go/issues/573 as a sample)

Review #302 and the linked meilisearch-go issue #573 to identify the integration issues created from that work. Compare the existing multi_search_federated_1 samples in the meilisearch-js and PHP integrations, then add equivalent samples to the missing integrations; done means the federated multi-search example is represented across those integrations.