Add widgets to the dashboard

[axentioialexandru95]

WE need to create widgets for the dashboard to see orders, customers, stats.

You can check the https://demo.filamentphp.com/ for inspiration

AC

• [x] Add revenue widget
• [x] New customers
• [x] New orders
• [x] Orders per month
• [x] Total customers
• [x] Add latest orders list widget

[bodnarescu-riccardo]

Added a seed DB for testing purposes.

To use it, just call: php artisan db:seed --class=TestSeeder