Refactor project structure and enhance functionality

Changed the project namespace from `Ghost.Editor` to `Ghost.App` across multiple files.
Changed the `InternalsVisibleTo` attribute in `AssemblyInfo.cs` to include `Ghost.App`.
Changed the `ProjectRepository` class to add new asynchronous methods for retrieving projects by ID, name, and metadata path.
Changed the `ProjectService` class to utilize the new asynchronous project loading methods.
Changed the `SceneGraph` classes to improve node management and serialization.
Changed the `EntityManager` class to enhance entity management with new component handling methods.
Added new test classes, `EntityTest` and `SerializationTest`, to ensure reliability in entity and serialization systems.
Added the `Ghost.App` project file to establish a modular project structure.
Added the `Ghost.Generator` project for automated component serialization code generation.
Updated UI components to reflect the new namespace for proper functionality.

Ghost.Engine/Components/LocalToWorld.cs

@@ -1,4 +1,4 @@
-using Ghost.Engine.Helpers;
+using Ghost.Engine.Utilities;
 using Ghost.Entities.Components;
 using System.Numerics;
 using System.Runtime.CompilerServices;
@@ -15,7 +15,7 @@ public struct LocalToWorld : IComponentData
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         get => new()
         {
-            matrix = MatrixHelpers.CreateTRS(Vector3.Zero, Quaternion.Identity, Vector3.One)
+            matrix = MatrixUtilities.CreateTRS(Vector3.Zero, Quaternion.Identity, Vector3.One)
         };
     }
 }