Added foreach macro for dynamic arrays

examples/da_foreach.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define LAZY_IMPL
+#include "../lazy.h"
+
+int main() {
+  srand(time(NULL));
+  Lz_DA(int) nums = {0};
+  for (int i = 0; i < 10; ++i) {
+    lz_da_append(nums, rand()%100);
+  }
+
+  lz_da_foreach(int, x, nums) {
+    printf("%d\n", *x);
+  }
+}