util.array: Expose new() on module table

For consistency with other utils.

Consistency is good.

util/array.lua

@@ -35,6 +35,8 @@ local function new_array(self, t, _s, _var)
 	return setmetatable(t or {}, array_mt);
 end
 
+array.new = new_array;
+
 function array_mt.__add(a1, a2)
 	local res = new_array();
 	return res:append(a1):append(a2);