pub fn collection_name(mut self, collection_name: &str) -> Self {
        self.collection_name = Some(collection_name.to_string());
        self
    }
Name of the collection in Qdrant. REQUIRED.
It is recommended to create a collection in advance, with the required configurations.
https://qdrant.tech/documentation/concepts/collections/#create-a-collection

If the collection doesn't exist, it will be created with the embedding provider's dimension
and Cosine similarity metric.
src/vectorstore/qdrant/builder.rs