Function create_namespace 

pub async fn create_namespace(
    configuration: &Configuration,
    id: &str,
    create_namespace_request: CreateNamespaceRequest,
    delimiter: Option<&str>,
) -> Result<CreateNamespaceResponse, Error<CreateNamespaceError>>

Create new namespace id. During the creation process, the implementation may modify user-provided properties, such as adding additional properties like created_at to user-provided properties, omitting any specific property, or performing actions based on any property value.