Function moq_client_set_backoff_initial 

#[unsafe(no_mangle)]
pub extern "C" fn moq_client_set_backoff_initial(
    client: u32,
    delay_ms: u64,
) -> i32

Set the delay before the first reconnect attempt, in milliseconds.

The delay grows from here by the multiplier after each failure. Defaults to 1s.

Returns zero on success, or a negative code if the handle is unknown.