add template for directives

fuzz/corpus/hashicorp%terraforminternal%terraform%testdata%graph-builder-plan-dynblock%dynblock.tf

@@ -0,0 +1,14 @@
+resource "test_thing" "a" {
+}
+
+resource "test_thing" "b" {
+}
+
+resource "test_thing" "c" {
+  dynamic "nested" {
+    for_each = test_thing.a.list
+    content {
+      foo = test_thing.b.id
+    }
+  }
+}