DetailPage: Fetch and Display Country Details

[kasimAbi]

• Fetch country details using: https://wft-geo-db.p.rapidapi.com/v1/geo/countries/{code}
• Display the country flag at the top of the detail page
• Display the country code on the detail page
• Create a button to navigate to Wikidata page from the country using the wikiDataId. For example: https://www.wikidata.org/wiki/Q30
• Add functionality to add the country to the saved list and remove the country from the saved list on the detail page
• Change the color of the favorite button based on whether the country is in the saved list or not