Fix Clipboard clear after time on iOS (#1679)

* Fixed Clipboard clear after x seconds depending on what the user set. Also refactored a bit to make the Clipboard a custom service to provide a better way to handle this situation #1464

* Clear some usings #1464

src/Android/Services/ClipboardService.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Threading.Tasks;
+using Android.App;
+using Android.Content;
+using Bit.Core;
+using Bit.Core.Abstractions;
+using Bit.Droid.Receivers;
+using Plugin.CurrentActivity;
+using Xamarin.Essentials;
+
+namespace Bit.Droid.Services
+{
+    public class ClipboardService : IClipboardService
+    {
+        private readonly IStorageService _storageService;
+        private readonly Lazy<PendingIntent> _clearClipboardPendingIntent;
+
+        public ClipboardService(IStorageService storageService)
+        {
+            _storageService = storageService;
+
+            _clearClipboardPendingIntent = new Lazy<PendingIntent>(() =>
+                PendingIntent.GetBroadcast(CrossCurrentActivity.Current.Activity,
+                                           0,
+                                           new Intent(CrossCurrentActivity.Current.Activity, typeof(ClearClipboardAlarmReceiver)),
+                                           PendingIntentFlags.UpdateCurrent));
+        }
+
+        public async Task CopyTextAsync(string text, int expiresInMs = -1)
+        {
+            await Clipboard.SetTextAsync(text);
+
+            await ClearClipboardAlarmAsync(expiresInMs);
+        }
+
+        private async Task ClearClipboardAlarmAsync(int expiresInMs = -1)
+        {
+            var clearMs = expiresInMs;
+            if (clearMs < 0)
+            {
+                // if not set then we need to check if the user set this config
+                var clearSeconds = await _storageService.GetAsync<int?>(Constants.ClearClipboardKey);
+                if (clearSeconds != null)
+                {
+                    clearMs = clearSeconds.Value * 1000;
+                }
+            }
+            if (clearMs < 0)
+            {
+                return;
+            }
+            var triggerMs = Java.Lang.JavaSystem.CurrentTimeMillis() + clearMs;
+            var alarmManager = CrossCurrentActivity.Current.Activity.GetSystemService(Context.AlarmService) as AlarmManager;
+            alarmManager.Set(AlarmType.Rtc, triggerMs, _clearClipboardPendingIntent.Value);
+        }
+    }
+}