Create Playwright setup

[johnSamilin]

Create Playwright tests setup that would mock window.electronAPI object and return mocked data from it's methods. Create test scenarios:

1. Fresh start
   1.1. Open an app
   1.2. Create a notebook
   1.3. Make sure it is visible in sidebar and selected
   1.4. Create a note named "1 note" and 2 lorem ipsum paragraphs
   1.5. Make sure it is visible in sidebar