Update to fetch data with URL Session Async Function

FetchAPITask.swift

func fetchAPI<D: Decodable>(url: URL) async throws -> D {
    let task = Task { () -> D in
        try await fetchAndDecode(url: url)
    }
    //...
}

func fetchAPIGroup<D: Decodable>(urls: [URL]) async throws -> [D] {
    try await withThrowingTaskGroup(of: D.self) { (group)  in
        for url in urls {
            group.async { try await fetchAndDecode(url: url) }
        }
        //...
    }
}