feat: 数组类型语法 [T; N] 改为 T[N] 后置语法

test/programs/18_array.l

@@ -1,5 +1,5 @@
 fn main() -> i64 {
-    let arr: [i64; 3] = arr;
+    let arr: i64[3] = arr;
     arr[0] = 10;
     arr[1] = 20;
     arr[2] = 30;

test/programs/24_array_struct.l

@@ -1,7 +1,7 @@
 struct Point { x: i64, y: i64 }
 
 fn main() -> i64 {
-    let arr: [Point; 2] = arr;
+    let arr: Point[2] = arr;
     arr[0] = Point { x: 10, y: 20 };
     arr[1] = Point { x: 30, y: 40 };
     print_i64(arr[0].x);