ns/nim: Stub eShop related calls (#1420)

* ns/nim: Stub eShop related calls

As we aren't able to process purchase on the eShop throught the emulator, I have:
- Stub IPurchaseEventManager::SetDefaultDeliveryTarget (with RE check).
- Implement IPurchaseEventManager::GetPurchasedEventReadableHandle (with RE check).

As we can't do any eShop async call throught the emulator, I have:
- Stub IShopServiceAccessServerInterface::CreateServerInterface
- Stub IShopServiceAccessServer::CreateAccessorInterface
- Stub IShopServiceAccessor::IShopServiceAsync

Close #1084 and #1322

* fix handle copy

* Fix align

* Fix readonly event

Ryujinx.HLE/HOS/Services/Nim/IShopServiceAccessServer.cs

@@ -0,0 +1,21 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Services.Nim.ShopServiceAccessServerInterface.ShopServiceAccessServer;
+
+namespace Ryujinx.HLE.HOS.Services.Nim.ShopServiceAccessServerInterface
+{
+    class IShopServiceAccessServer : IpcService
+    {
+        public IShopServiceAccessServer() { }
+
+        [Command(0)]
+        // CreateAccessorInterface(u8) -> object<nn::ec::IShopServiceAccessor>
+        public ResultCode CreateAccessorInterface(ServiceCtx context)
+        {
+            MakeObject(context, new IShopServiceAccessor(context.Device.System));
+
+            Logger.PrintStub(LogClass.ServiceNim);
+
+            return ResultCode.Success;
+        }
+    }
+}