Enum.uniq_by/3 with 3rd arg - a function that decides which value to keep

[Anastasiya Dyachenko]

Hi! I'd like to propose adding a 3rd optional argument to Enum.uniq_by function, which will decide which one of the duplicated values should be kept. This function will accept 2 values and return one of them, that should be kept.

Example: 

Enum.uniq_by(

  [a: 1, a: 2], 

  fn {k, v} -> k end, 

  fn {_, v_a} = a,  {_, v_b} = b ->

    if v_a >= v_b, do: a, else: b

  end

)

=> [a: 2]

[José Valim]

Hi Anastasiya, I like the proposal. A PR will be appreciated, thank you!

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