organize event models. stub out event services

src/Core/Services/IEventService.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Threading.Tasks;
+using Bit.Core.Enums;
+
+namespace Bit.Core.Services
+{
+    public interface IEventService
+    {
+        Task LogUserEventAsync(Guid userId, EventType type);
+    }
+}

src/Core/Services/Implementations/EventService.cs

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+using System.Threading.Tasks;
+using System;
+using Bit.Core.Enums;
+using Bit.Core.Repositories;
+using Bit.Core.Models.Data;
+
+namespace Bit.Core.Services
+{
+    public class EventService : IEventService
+    {
+        private readonly IEventRepository _eventRepository;
+        private readonly GlobalSettings _globalSettings;
+
+        public EventService(
+            IEventRepository eventRepository,
+            GlobalSettings globalSettings)
+        {
+            _eventRepository = eventRepository;
+            _globalSettings = globalSettings;
+        }
+
+        public async Task LogUserEventAsync(Guid userId, EventType type)
+        {
+            var userEvent = new UserEvent(userId, type);
+            await _eventRepository.CreateAsync(userEvent);
+        }
+    }
+}

src/Core/Services/NoopImplementations/NoopEventService.cs

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+using System;
+using System.Threading.Tasks;
+using Bit.Core.Enums;
+
+namespace Bit.Core.Services
+{
+    public class NoopEventService : IEventService
+    {
+        public Task LogUserEventAsync(Guid userId, EventType type)
+        {
+            return Task.FromResult(0);
+        }
+    }
+}