统计数组中的元素个数 
by 凤之兮原 @kongmingLatern
通过实现一个``CountElementNumberToObject``方法，统计数组中相同元素的个数
~~~ts
type Simple1 = CountElementNumberToObject<[]> // return {}
type Simple2 = CountElementNumberToObject<[1,2,3,4,5]>
/*
return {
1: 1,
2: 1,
3: 1,
4: 1,
5: 1
}
*/
type Simple3 = CountElementNumberToObject<[1,2,3,4,5,[1,2,3]]>
/*
return {
1: 2,
2: 2,
3: 2,
4: 1,
5: 1
}
*/
~~~
