chore: modify getrealTime return type

jensen.d.ts

@@ -137,7 +137,7 @@ declare class Jensen {
   startRealtime: () => Promise<ReturnStruct['common']>;
   pauseRealtime: () => Promise<ReturnStruct['common']>;
   stopRealtime: () => Promise<ReturnStruct['common']>;
-  getRealtime: (frames: number) => Promise<string>;
+  getRealtime: (frames: number) => Promise<{ data: Uint8Array; rest: number }>;
 }
 
 export = Jensen;