App router migration root layout

[boodland]

Parent PR for the progressive migration of _app.tsx and _document.tsx within the Root Layout

Issue link / number:

#1083

What changes did you make?

1. Created basic root layout
2. Added metadata to root layout
3. Created public testing page to check migration

Why did you make the changes?

In order to be able to migrate the product from pages router to app router and benefits of all the new features available in the app router

Did you run tests?

Yes

Navigate to http://localhost:3000/public-route-test to check that title, charset and viewport meta tags are added properly