add template for directives

fuzz/corpus/hashicorp%terraforminternal%terraform%testdata%input-variables%main.tf

@@ -0,0 +1,30 @@
+# Required
+variable "foo" {
+}
+
+# Optional
+variable "bar" {
+  default = "baz"
+}
+
+# Mapping
+variable "map" {
+  default = {
+    foo = "bar"
+  }
+}
+
+# Complex Object Types
+variable "object_map" {
+  type = map(object({
+    foo = string,
+    bar = any
+  }))
+}
+
+variable "object_list" {
+  type = list(object({
+    foo = string,
+    bar = any
+  }))
+}