move beat-saver service in main

src/main/helpers/array-tools.ts

@@ -0,0 +1,7 @@
+export function splitIntoChunk<T = unknown>(arr: T[], chunkSize: number): T[][] {
+    const resArr = [];
+    for(let i = 0; i < arr.length; i += chunkSize){
+        resArr.push(arr.slice(i, i + chunkSize));
+    }
+    return resArr;
+}