Refactor asset streaming, error handling, and unit tests

- Add new compile-time constants and update package versions
- Refactor AssetEntry upload logic to return Result and propagate errors
- Enhance error handling in ResourceStreamingProcessor uploads
- Make ResourceStreamingContext a readonly struct
- Implement IDisposable and finalizers for resource cleanup
- Overhaul AssetManagerTest with async tests and improved mocks
- Add mock implementations for graphics interfaces for testing
- Refactor MockingCommandBuffer and MockingResourceDatabase for better simulation
- Update internals visibility for unit testing

src/Test/Ghost.UnitTest/MockingEnvironment/MockingFence.cs

@@ -0,0 +1,52 @@
+using Ghost.Graphics.RHI;
+
+namespace Ghost.UnitTest.MockingEnvironment;
+
+internal class MockingFence : IFence
+{
+    private readonly AutoResetEvent _fenceEvent;
+
+    private ulong _currentValue;
+
+    public ulong CompletedValue => _currentValue;
+
+    public nint WaitHandle => _fenceEvent.SafeWaitHandle.DangerousGetHandle();
+
+    public string Name
+    {
+        get; set;
+    } = "MockingFence";
+
+    public MockingFence(ulong initialValue)
+    {
+        _fenceEvent = new AutoResetEvent(false);
+        _currentValue = initialValue;
+    }
+
+    public void Signal(ulong value)
+    {
+        if (value > _currentValue)
+        {
+            _currentValue = value;
+            _fenceEvent.Set();
+        }
+    }
+
+    public void WaitForValue(ulong value)
+    {
+        if (value > _currentValue)
+        {
+            _fenceEvent.WaitOne();
+        }
+    }
+
+    public Task WaitForValueAsync(ulong value)
+    {
+        return Task.Run(() => { WaitForValue(value); });
+    }
+
+    public void Dispose()
+    {
+        _fenceEvent.Dispose();
+    }
+}