feat: 添加数组字面量和索引访问功能，更新解析器和解释器以支持数组操作

examples/array.ast

@@ -0,0 +1,39 @@
+let arr = [10, 20, 30, 40, 50]
+print(arr)
+
+print(arr[0] + arr[4])
+
+let i = 1
+while(i < 4) {
+    print(arr[i])
+    i = i + 1
+}
+
+arr[0] = 99
+print(arr)
+
+for (let j = 0; j < 3; j = j + 1) {
+    arr[j] = arr[j] * 2
+}
+print(arr)
+
+let nested = [[1, 2], [3, 4], [5, 6]]
+print(nested[1][0])
+
+let empty = []
+print(empty)
+
+let mixed = [1, "hello", true, nil]
+print(mixed)
+print(mixed[1][0])
+
+let same = [1, 2, 3]
+let other = [1, 2, 3]
+print(same == other)
+print(same != [3, 2, 1])
+
+let item = { name: "sword", price: 100 }
+let items = [item, { name: "shield", price: 50 }]
+print(items[0].name)
+items[1].price = 75
+print(items[1].price)