Merge #2454

2454: Unify the pagination of the index and documents route behind a common type r=curquiza a=irevoire

`@MarinPostma` wdyt of keeping the `auto_paginate_sized` until we implement the pagination on every route that needs it just to see if it could be useful to something else

Co-authored-by: Tamo <tamo@meilisearch.com>

meilisearch-http/tests/documents/add_documents.rs

@@ -827,7 +827,7 @@ async fn add_larger_dataset() {
             ..Default::default()
         })
         .await;
-    assert_eq!(code, 200);
+    assert_eq!(code, 200, "failed with `{}`", response);
     assert_eq!(response["results"].as_array().unwrap().len(), 77);
 }