Add hotkeys to switch auto scroll direction

While auto scroll is active, the direction can be changed via the "scroll backward/forward" hotkeys

src/modules/reader/contexts/ReaderAutoScrollContext.tsx

@@ -18,6 +18,7 @@ export const ReaderAutoScrollContext = createContext<TReaderAutoScrollContext>({
     toggleActive: () => {},
     pause: () => {},
     resume: () => {},
+    setDirection: () => {},
 });
 
 export const useReaderAutoScrollContext = () => useContext(ReaderAutoScrollContext);