chore(deps): setup Playwright for screenshots and e2e tests

[Antreesy]

☑️ Resolves

• installed via 'npm init playwright@latest', so there are additional packages installed globally (browsers, types)

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🚧 Tasks

• package.json script
• CI .yml runner
• .env file for local and CI runs
• dedicated docker (e.g. as in PHP integration tests) - or use the same?
• mocked data (conversations, messages, users) for screenshots
• media devices?
• HPB setup?

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Integrations with Files sidebar and other apps
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required