Add mailing plugin with templates, outbox, and job processing

dev/e2e.spec.ts

@@ -0,0 +1,15 @@
+import { expect, test } from '@playwright/test'
+
+// this is an example Playwright e2e test
+test('should render admin panel logo', async ({ page }) => {
+  await page.goto('/admin')
+
+  // login
+  await page.fill('#field-email', 'dev@payloadcms.com')
+  await page.fill('#field-password', 'test')
+  await page.click('.form-submit button')
+
+  // should show dashboard
+  await expect(page).toHaveTitle(/Dashboard/)
+  await expect(page.locator('.graphic-icon')).toBeVisible()
+})