refactor: statistics on result set

Refactored statistics script to it's own directory such that we can use it as a node js service later down the road.

libs/shared/lib/statistics/utils/attributeStats/array.ts

+import { ArrayStats } from '../../statistics.types';
+
+const updateArrayStats = (stats: ArrayStats, value: any[]) => {
+  stats.length = value.length;
+};
+
+export { updateArrayStats };