[PM-11123] Service layer for Notification Center (#4741)

* PM-11123: Service layer

* PM-11123: Service layer for Notification Center

* PM-11123: Throw error on unsupported requirement

* PM-11123: Missing await

* PM-11123: Cleanup

* PM-11123: Unit Test coverage

* PM-11123: Flipping the authorization logic to be exact match of fail, formatting

* PM-11123: Async warning

* PM-11123: Using AuthorizeOrThrowAsync, removal of redundant set new id

* PM-11123: UT typo

* PM-11123: UT fix

src/Core/NotificationCenter/Queries/GetNotificationsForUserQuery.cs

@@ -0,0 +1,37 @@
+#nullable enable
+using Bit.Core.Context;
+using Bit.Core.Exceptions;
+using Bit.Core.NotificationCenter.Entities;
+using Bit.Core.NotificationCenter.Models.Filter;
+using Bit.Core.NotificationCenter.Queries.Interfaces;
+using Bit.Core.NotificationCenter.Repositories;
+using Bit.Core.Utilities;
+
+namespace Bit.Core.NotificationCenter.Queries;
+
+public class GetNotificationsForUserQuery : IGetNotificationsForUserQuery
+{
+    private readonly ICurrentContext _currentContext;
+    private readonly INotificationRepository _notificationRepository;
+
+    public GetNotificationsForUserQuery(ICurrentContext currentContext,
+        INotificationRepository notificationRepository)
+    {
+        _currentContext = currentContext;
+        _notificationRepository = notificationRepository;
+    }
+
+    public async Task<IEnumerable<Notification>> GetByUserIdStatusFilterAsync(NotificationStatusFilter statusFilter)
+    {
+        if (!_currentContext.UserId.HasValue)
+        {
+            throw new NotFoundException();
+        }
+
+        var clientType = DeviceTypes.ToClientType(_currentContext.DeviceType);
+
+        // Note: only returns the user's notifications - no authorization check needed
+        return await _notificationRepository.GetByUserIdAndStatusAsync(_currentContext.UserId.Value, clientType,
+            statusFilter);
+    }
+}