Create a method that accept a List of 'Sets of integers' and return a list with the sums of all 'Sets of integers' in the input list.
Sample Input and Output:
A sample input will a list with 2 sets with values (1,2,3) and (4,5). The method will have to return a list with values 6 and 9.
Method signature will look like:
public List<Integer> addAll(List<Set<Integer>> addList)
ALL THE BEST!!!