[Breaking] Remove Layout Mode and Size Storage

[ppth0608]

Summary

This PR removes the deprecated layout mode system and component size storage
functionality from KarrotListKit. These features were no longer being used and
added unnecessary complexity to the codebase.

Changes

• Removed layoutMode property from Component protocol and AnyComponent
  • Deleted ContentLayoutMode enum entirely
  • Cleaned up related test code
• Removed sizeStorage functionality
  • Deleted ComponentSizeStorage class
  • Removed size storage integration from CollectionViewAdapter and CollectionViewLayoutAdaptable
  • Cleaned up size storage usage in collection view cells and reusable views
• Removed unused section layout implementations
  • Deleted DefaultCompositionalLayoutSectionFactory, HorizontalLayout,
    VerticalGridLayout, and VerticalLayout classes
  • Simplified CompositionalLayoutSectionFactory by removing layout-specific
    logic
  • Updated Section to remove layout-related properties
• Updated documentation and sample app
  • Updated README to reflect the removal of layout mode
  • Simplified sample app code that was using the removed features

Impact

This is a breaking change that removes previously deprecated APIs. Projects
using layoutMode, sizeStorage, or the removed layout classes will need to
migrate to alternative approaches.

Testing

• All existing tests have been updated
• Removed tests specific to the deleted functionality
• Sample app has been tested and works correctly without these features

[ppth0608]

@jaxtynSong 이 작업하신 내용이에요. PR만 대신 올렸어요!

[stleamist]

p3; 주입되지 않는 속성이라 private let으로 작성해도 될 것 같은데 어떨까요?

Suggested change

	private var windowView = UIWindow()
	private let _window = UIWindow()

[ppth0608]

019b10a에서 반영했어요~

[stleamist]

👍🏻👍🏻