App Router Migration - Root Layout

[boodland]

Sub issue of #702

App router uses a Root layout which is defined at the top of the app directory and applies to all routes. We need to migrate the contents of _app.tsx and _document.tsx to the root layout so they are applied for the app route.

Due to the complexity of the _app.tsx and _document.tsx files, the migration will be done according to the following steps as discussed in #1064:

1. Creating the app directory and basic root layout with public testing page #1085
2. Add Newrelic configuration #1086
3. Add GoogleTagManager script #1117
4. Add Rollbar script #1118
5. Add OpenGraph Metadata #1120
6. Add ErrorBoundary component #1121
7. Add Material UI configuration #1122
8. Add Analytics configuration #1123

Step one will be the parent PR/branch where the rest of the steps will be created from and merged to, once all the steps are completed and merged the PR/branch can be merged within dev branch.

Store Provider, i18n, Shell layout, Crisp script, AuthGuard and pages migration will be tackled in another parent PR as discussed in #1064 due to conflict with pages router and/or dependencies on i18n.

Until all pages are migrated and _app.tsx and _document.tsx files are removed any changes in any of the logic migrated to the app router needs to be changed accordingly for the app router version as well.