Récupère les détails d’un message spécifique, y compris les ID des frères pour les branchements.
Successful Response
Unique identifier for the message.
Role of the message sender (user, assistant, system).
Content of the message.
Creation timestamp.
ID of the parent message.
IDs of other messages that share the same parent (branches).
The ID of the task processing this message (if applicable).
URL to stream events for this task.