RealtimeClientEventConversationItemDelete

Send this event when you want to remove any item from the conversation
history. The server will respond with a conversation.item.deleted event,
unless the item does not exist in the conversation history, in which case the
server will respond with an error.

{
    "event_id": "string",
    "type": "conversation.item.delete",
    "item_id": "string"
}