[Feature request]: Data partition

[lopi-py]

I find myself doing this often:

local numbers = { 1, 4, 2, 3, 1, 1, 3 }
local ones = Sift.Array.filter(numbers, function(number)
    return number == 1
end)
local noOnes = Sift.Array.filter(numbers, function(number)
    return number ~= 1
end)

It would be nice to have a partition/split method to separate data:

local numbers = { 1, 4, 2, 3, 1, 1, 3 }
local ones, noOnes = Sift.Array.partition(numbers, function(number)
    return number == 1
end)

print(ones) -- { 1, 1, 1 }
print(noOnes) -- { 4, 2, 3, 3 }

It could also apply for Set and Dictionary