Integrate performance monitoring across various editors

- Added performance monitoring capabilities using ScopedTimer in the DungeonEditor, PaletteEditor, ScreenEditor, MessageEditor, MusicEditor, SpriteEditor, and SettingsEditor classes to track loading times.
- Enhanced the Load methods in each editor to include timing for critical operations, improving performance analysis and optimization.
- Removed unnecessary debug output in the Sprite class to clean up the codebase.

src/app/editor/sprite/sprite_editor.cc

@@ -1,5 +1,6 @@
 #include "sprite_editor.h"
 
+#include "app/core/performance_monitor.h"
 #include "app/core/platform/file_dialog.h"
 #include "app/editor/sprite/zsprite.h"
 #include "app/gfx/arena.h"
@@ -24,7 +25,10 @@ using ImGui::Text;
 
 void SpriteEditor::Initialize() {}
 
-absl::Status SpriteEditor::Load() { return absl::OkStatus(); }
+absl::Status SpriteEditor::Load() { 
+  core::ScopedTimer timer("SpriteEditor::Load");
+  return absl::OkStatus(); 
+}
 
 absl::Status SpriteEditor::Update() {
   if (rom()->is_loaded() && !sheets_loaded_) {