Added new RHI abstraction layer;

Added new console debug page to UnitTest;

Ghost.Graphics/RHI/ICommandQueue.cs

@@ -0,0 +1,53 @@
+namespace Ghost.Graphics.RHI;
+
+/// <summary>
+/// D3D12-style command queue interface
+/// </summary>
+public interface ICommandQueue : IDisposable
+{
+    /// <summary>
+    /// Type of commands this queue can execute
+    /// </summary>
+    CommandQueueType Type { get; }
+
+    /// <summary>
+    /// Submits a single command buffer for execution
+    /// </summary>
+    /// <param name="commandBuffer">Command buffer to submit</param>
+    void Submit(ICommandBuffer commandBuffer);
+
+    /// <summary>
+    /// Submits multiple command buffers for execution
+    /// </summary>
+    /// <param name="commandBuffers">Command buffers to submit</param>
+    void Submit(ICommandBuffer[] commandBuffers);
+
+    /// <summary>
+    /// Signals a fence with the specified value
+    /// </summary>
+    /// <param name="value">Value to signal</param>
+    /// <returns>The fence value that was signaled</returns>
+    ulong Signal(ulong value);
+
+    /// <summary>
+    /// Waits for the fence to reach the specified value
+    /// </summary>
+    /// <param name="value">Value to wait for</param>
+    void WaitForValue(ulong value);
+
+    /// <summary>
+    /// Gets the last completed fence value
+    /// </summary>
+    /// <returns>Last completed fence value</returns>
+    ulong GetCompletedValue();
+}
+
+/// <summary>
+/// Command queue types matching D3D12
+/// </summary>
+public enum CommandQueueType
+{
+    Graphics,
+    Compute,
+    Copy
+}