[ember] refactor @ember/test types into their own module (#28804)

fixes https://github.com/typed-ember/ember-cli-typescript/issues/278

types/ember__test/adapter.d.ts

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+import Ember from 'ember';
+export default class TestAdapter extends Ember.Test.Adapter { }

types/ember__test/ember__test-tests.ts

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+import { registerWaiter, registerHelper, registerAsyncHelper } from '@ember/test';
+import TestAdapter from '@ember/test/adapter';
+
+const pending = 0;
+registerWaiter(() => pending !== 0);
+
+declare const MyDb: {
+    hasPendingTransactions(): boolean;
+};
+
+registerWaiter(MyDb, MyDb.hasPendingTransactions);
+registerWaiter(); // $ExpectError
+
+registerHelper('boot', app => {
+    app.advanceReadiness(); // $ExpectType void
+    app.deferReadiness(); // $ExpectType void
+    app.register('foo', class {}); // $ExpectType void
+    app.register('foo'); // $ExpectError
+    app.register(); // $ExpectError
+});
+
+registerAsyncHelper('boot', app => {
+    app.advanceReadiness();
+    app.deferReadiness();
+    app.register('foo', class {});
+});
+
+registerAsyncHelper('waitForPromise', (app, promise) => {
+    app.advanceReadiness();
+    app.deferReadiness();
+    app.register('foo', class {});
+    return new Promise(() => {
+        const adapter = new TestAdapter();
+        adapter.asyncStart();
+        return promise.then(() => {
+            adapter.asyncEnd();
+        });
+    });
+});

types/ember__test/index.d.ts

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+// Type definitions for @ember/test 3.0
+// Project: http://emberjs.com/
+// Definitions by: Mike North <https://github.com/mike-north>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import Ember from 'ember';
+export const registerAsyncHelper: typeof Ember.Test.registerAsyncHelper;
+export const registerHelper: typeof Ember.Test.registerHelper;
+export const registerWaiter: typeof Ember.Test.registerWaiter;
+export const unregisterHelper: typeof Ember.Test.unregisterHelper;
+export const unregisterWaiter: typeof Ember.Test.unregisterWaiter;

types/ember__test/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es5",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "paths": {
+            "@ember/test": ["ember__test"],
+            "@ember/test/*": ["ember__test/*"]
+        },
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "adapter.d.ts",
+        "ember__test-tests.ts"
+    ]
+}

types/ember__test/tslint.json

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+{
+    "extends": "dtslint/dt.json",
+    "rules": { }
+}