Collection Types - Lists

[mohitk05]

This PR introduces dynamic arrays or lists in Gom.

import io;

type Numbers = [int];
type Status = {
  code: int,
  success: bool,
};
type StatusList = [Status];
type Pairs = [{ int, int }];

fn main() {
  let numbers = Numbers { 1, 2, 3, 4, 5 };

  let i = 0;
  for(i; i < numbers.size; i = i + 1) {
    io.log("numbers[", i, "] = ", numbers.i);
  }

  let statusList = StatusList {
    Status { code: 200, success: true },
    Status { code: 404, success: false },
    Status { code: 500, success: false },
  };
  let j = 0;
  for(j; j < statusList.size; j = j + 1) {
    let status = statusList.j;
    io.log("statusList[", j, "] = { code: ", status.code, ", success: ", status.success, " }");
  }

  let pairs = Pairs {
    { 1, 2 },
    { 3, 4 },
    { 5, 6 },
    { 7, 8 },
    { 9, 10 },
  };
  let k = 0;
  for(k; k < pairs.size; k = k + 1) {
    let pair = pairs.k;
    io.log("pairs[", k, "] = { ", pair.0, ", ", pair.1, " }");
  }
}