time: consolidate the different sleep functions into time.wait(Duration) (#8853)

examples/hot_reload/message.v

@@ -13,6 +13,6 @@ fn print_message() {
 fn main() {
 	for {
 		print_message()
-		time.sleep_ms(500)
+		time.wait(500 * time.millisecond)
 	}
 }