Element attributes in Djot ({.class #id key="value"} syntax).
Matches the Rust Attributes struct.
Attributes
@type t() :: %Kreuzberg.DjotAttributes{ classes: [String.t()], id: String.t() | nil, key_values: [{String.t(), String.t()}] }
@spec from_map(map()) :: t()
@spec to_map(t()) :: map()