[elixir-core:10808] [Proposal] add an option to disable underscore_ints on formatter

[Federico Bianchi]

currently we are using this patch:
 
  defp state(comments, opts) do
    underscore_ints = Keyword.get(opts, :underscore_ints, true)
 
  defp integer_to_algebra(text, state) do
    case text do
      <<?0, ?x, rest::binary>> ->
        "0x" <> String.upcase(rest)

      <<?0, base, _::binary>> = digits when base in [?b, ?o] ->
        digits

      <<??, _::binary>> = char ->
        char

      decimal ->
        if state[:underscore_ints] do
          insert_underscores(decimal)
        else
          decimal
        end
    end
  end

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