feat: add runtime play tick and play-mode scene editing semantics

editor/src/Core/PlaySessionController.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "EditorRuntimeMode.h"
+#include "SceneSnapshot.h"
+
+#include <XCEngine/Scene/RuntimeLoop.h>
+
+#include <cstdint>
+
+namespace XCEngine {
+namespace Editor {
+
+class IEditorContext;
+
+class PlaySessionController {
+public:
+    void Attach(IEditorContext& context);
+    void Detach(IEditorContext& context);
+
+    void Update(IEditorContext& context, float deltaTime);
+
+    bool StartPlay(IEditorContext& context);
+    bool StopPlay(IEditorContext& context);
+    bool PausePlay(IEditorContext& context);
+
+private:
+    uint64_t m_playStartRequestedHandlerId = 0;
+    uint64_t m_playStopRequestedHandlerId = 0;
+    uint64_t m_playPauseRequestedHandlerId = 0;
+    SceneSnapshot m_editorSnapshot = {};
+    XCEngine::Components::RuntimeLoop m_runtimeLoop;
+};
+
+} // namespace Editor
+} // namespace XCEngine