Adds async await support to WidgetCenter configuration fetch

widget-center-async-await.swift

import WidgetKit

extension WidgetCenter {
    func currentConfigurations() async throws -> [WidgetInfo] {
        try await withCheckedThrowingContinuation { continuation in
            getCurrentConfigurations { result in
                continuation.resume(with: result)
            }
        }
    }
}