Function descriptors_to_items

fn descriptors_to_items(
    cls: &Ident,
    rename_all: Option<&KeywordAttribute<rename_all, RenamingRuleLitStr>>,
    frozen: Option<frozen>,
    field_options: Vec<(&Field, FieldPyO3Options)>,
    ctx: &Ctx,
) -> Result<Vec<MethodAndMethodDef>>