A user message item.
Summary
Types
@type t() :: %Codex.Realtime.Items.UserMessageItem{ content: [ Codex.Realtime.Items.InputText.t() | Codex.Realtime.Items.InputAudio.t() | Codex.Realtime.Items.InputImage.t() ], item_id: String.t(), previous_item_id: String.t() | nil, role: :user, type: :message }