The insertMany should now support generating embeddings for a specific field. To do so it needs to:

1. Check the vectorSearch indexes for a specific collection.
2. If there is a vectorSearch that uses a field for the embeddings
3. Check in a new embeddings tool parameter the model use to apply the embedding
4. Generate the embedding and replace the raw value
5. Insert the documents

If the field stores embeddings and no embedding model is provided for that field, the tool must reject the command.