feat: 3D camera added

Engine.Core/Abstract/ICamera3D.cs

@@ -0,0 +1,26 @@
+namespace Engine.Core;
+
+/// <summary>
+/// Represents a 3D camera in the engine.
+/// </summary>
+public interface ICamera3D : IBehaviour3D
+{
+    /// <summary>
+    /// Field of View (FOV) value of the camera
+    /// </summary>
+    float FieldOfView { get; set; }
+
+    /// <summary>
+    /// Converts a position from screen coordinates to a <see cref="Ray3D"/>.
+    /// </summary>
+    /// <param name="screenPosition">The position in screen coordinates.</param>
+    /// <returns>The <see cref="Ray3D"/> originating from the camera to the screen position in world coordinates.</returns>
+    Ray3D ScreenToWorldRay(Vector2D screenPosition);
+
+    /// <summary>
+    /// Converts a position from world coordinates to screen coordinates.
+    /// </summary>
+    /// <param name="worldPosition">The position in world coordinates.</param>
+    /// <returns>The position in screen coordinates.</returns>
+    Vector2D WorldToScreenPosition(Vector3D worldPosition);
+}