Function multi_call 

pub async fn multi_call<TMessage, TReply, TMsgBuilder>(
    actors: &[ActorRef<TMessage>],
    msg_builder: TMsgBuilder,
    timeout_option: Option<Duration>,
) -> Result<Vec<CallResult<TReply>>, MessagingErr<TMessage>>
where
    TMessage: Message,
    TReply: Send + 'static,
    TMsgBuilder: Fn(RpcReplyPort<TReply>) -> TMessage,

Sends an asynchronous request to the specified actors, building a one-time use reply channel for each actor and awaiting the results with the specified timeout

• actors - A reference to the group of ActorCells to communicate with
• msg_builder - The FnOnce to construct the message
• timeout_option - An optional Duration which represents the amount of time until the operation times out

Returns [Ok(Vec<CallResult<TReply>>>)] upon successful initial sending with the reply from the crate::Actors, [Err(MessagingErr)] if the initial send operation failed