feat: async plugins (#2030)

* feat: async plugins

* wip: async config

* fix: async config

test/plugins/.gitignore

@@ -0,0 +1 @@
+media

test/plugins/config.ts

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+import { buildConfig } from '../buildConfig';
+import { devUser } from '../credentials';
+
+export const pagesSlug = 'pages';
+
+export default buildConfig({
+  collections: [
+    {
+      slug: 'users',
+      auth: true,
+      fields: [],
+    },
+  ],
+  plugins: [
+    async (config) => ({
+      ...config,
+      collections: [
+        ...config.collections || [],
+        {
+          slug: pagesSlug,
+          fields: [
+            {
+              name: 'title',
+              type: 'text',
+            },
+          ],
+        },
+      ],
+    }),
+  ],
+  onInit: async (payload) => {
+    await payload.create({
+      collection: 'users',
+      data: {
+        email: devUser.email,
+        password: devUser.password,
+      },
+    });
+  },
+});

test/plugins/int.spec.ts

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+import { initPayloadTest } from '../helpers/configHelpers';
+import { RESTClient } from '../helpers/rest';
+import configPromise, { pagesSlug } from './config';
+import payload from '../../src';
+
+require('isomorphic-fetch');
+
+let client;
+
+describe('Collections - Plugins', () => {
+  beforeAll(async () => {
+    const { serverURL } = await initPayloadTest({ __dirname, init: { local: false } });
+    const config = await configPromise;
+    client = new RESTClient(config, { serverURL, defaultSlug: pagesSlug });
+    await client.login();
+  });
+
+  it('created pages collection', async () => {
+    const { id } = await payload.create({
+      collection: pagesSlug,
+      data: {
+        title: 'Test Page',
+      },
+    });
+
+    expect(id).toEqual(expect.any(String));
+  });
+});