Function convert_class 

fn convert_class(
    id: &str,
    name: &str,
    bases: &[ChunkExpr],
    decorators: &[ChunkExpr],
    docstring: Option<&str>,
    chunks_by_id: &HashMap<&str, &Chunk>,
    chunks_by_parent: &HashMap<&str, Vec<&Chunk>>,
    type_hint_for_annotation_id: &HashMap<String, Expr>,
) -> Result<Class>