Merge #5371

5371: Composite embedders r=irevoire a=dureuill

# Pull Request

## Related issue
Fixes #5343 

## What does this PR do?
- Implement [public usage](https://www.notion.so/meilisearch/Composite-embedder-usage-14a4b06b651f81859dc3df21e8cd02a0)
- Refactor the way we check if a parameter is mandatory/allowed/disallowed for a given source
- Take the "nesting context" into account for computer if a parameter is mandatory/allowed/disallowed
- Add tests checking all parameters with all sources, and made sure the results didn't change compared with v1.13

## Dumpless Upgrade

- This adds a new value for an existing parameter => compatible without change
- This adds new optional parameters => compatible without change

Co-authored-by: Louis Dureuil <louis@meilisearch.com>

crates/meilisearch/src/routes/indexes/settings_analytics.rs

@@ -512,6 +512,7 @@ impl EmbeddersAnalytics {
                     EmbedderSource::UserProvided => sources.insert("userProvided".to_string()),
                     EmbedderSource::Ollama => sources.insert("ollama".to_string()),
                     EmbedderSource::Rest => sources.insert("rest".to_string()),
+                    EmbedderSource::Composite => sources.insert("composite".to_string()),
                 };
             }
         };

crates/meilisearch/src/search/mod.rs

@@ -916,7 +916,7 @@ fn prepare_search<'t>(
                     let deadline = std::time::Instant::now() + std::time::Duration::from_secs(10);
 
                     embedder
-                        .embed_one(query.q.clone().unwrap(), Some(deadline))
+                        .embed_search(query.q.clone().unwrap(), Some(deadline))
                         .map_err(milli::vector::Error::from)
                         .map_err(milli::Error::from)?
                 }