#337 Grouping Profiles by Organization and Group

Group the data so that the first Map uses organizationId as the key and contains another Map as its value, where groupId is the key and List<Profile> is the value:

static public class Profile {
        public Long id;
        public Long organizationId;
        public Long groupId;
}

public Map<Long, Map<Long, List<Profile>>> groupByOrgIdAndGroupId(List<Profile> data) {
    ...
}

Example:
[1, 0, 1]
[2, 0, 1]
[3, 0, 2]
[4, 1, 1]
[5, 1, 2]

Result:
{
    "0": {
        "1" : [{1..}, {2..}],
        "2" : [{3..}],
    }
    "1": {
        "1" : [{4..}],
        "2" : [{5..}]
    }
}