feat(bootloader-interface): add support for marking when the menu is being display

src/integrations/bootloader_interface.rs

@@ -25,6 +25,11 @@ impl BootloaderInterface {
         Self::mark_time("LoaderTimeExecUSec", timer)
     }
 
+    /// Tell the system that Sprout is about to display the menu.
+    pub fn mark_menu(timer: &PlatformTimer) -> Result<()> {
+        Self::mark_time("LoaderTimeMenuUsec", timer)
+    }
+
     /// Tell the system about the current time as measured by the platform timer.
     /// Sets the variable specified by `key` to the number of microseconds.
     fn mark_time(key: &str, timer: &PlatformTimer) -> Result<()> {