perf(@nestjs/graphql): add nullable type and header using structure

Construct all the contents of the generated typescript file by structure

Author: katainaka0503

packages/apollo/tests/generated-definitions/array-property.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Foo {
     a: string[];
     b?: Nullable<string[]>;

packages/apollo/tests/generated-definitions/custom-header.fixture.ts

@@ -9,6 +9,5 @@
 /* eslint-disable */
 
 /* Put anything here you like */
-
 export type CustomDate = any;
 type Nullable<T> = T | null;

packages/apollo/tests/generated-definitions/enum.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export enum Foobar {
     Foo = "Foo",
     Bar = "Bar",

packages/apollo/tests/generated-definitions/federation-typedef.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export enum Animal {
     DOG = "DOG",
     CAT = "CAT"

packages/apollo/tests/generated-definitions/federation.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export enum Category {
     POST = "POST"
 }

packages/apollo/tests/generated-definitions/interface-property.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Bar {
     id: number;
 }

packages/apollo/tests/generated-definitions/mutation.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Cat {
     id: number;
 }

packages/apollo/tests/generated-definitions/query-skip-args.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Cat {
     id: number;
 }

packages/apollo/tests/generated-definitions/query.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Cat {
     id: number;
 }

packages/apollo/tests/generated-definitions/simple-type.fixture.ts

@@ -7,6 +7,7 @@
 
 /* tslint:disable */
 /* eslint-disable */
+
 export interface Cat {
     id: number;
     name: string;