A document content block (type: "document").
type: "document"
"application/pdf"
@type t() :: %Gemini.Types.Interactions.DocumentContent{ data: String.t() | nil, mime_type: String.t() | nil, type: String.t(), uri: String.t() | nil }
@spec from_api(map() | nil) :: t() | nil
@spec to_api(t() | map() | nil) :: map() | nil