List additions

Operations in front of the list take constant time, operations at the end take linear time.

import gleam/io
import gleam/list

pub fn main() {
  let my_list = [2, 3, 4]
  io.debug(my_list)

  let my_list = [1, ..my_list]
  io.debug(my_list)

  let my_list = list.append(my_list, [5])
  io.debug(my_list)
}

$ gleam run
[2, 3, 4]
[1, 2, 3, 4]
[1, 2, 3, 4, 5]