Add ORBPath native implementations

[Kyle-Ye]

Changes

ORBPath.cpp

• Update ORBPathMakeRect to use native storage instead of CGPath wrapper
• Add ORBPathApplyElements function
• Add new path elements: ORBPathElementRect, ORBPathElementEllipse, ORBPathElementRoundedRect

PathStorage.cpp (C++ implementation)

• Add static local cgpath_callbacks for CGPath creation
• Add append_element() and append_element_callback() stubs
• Implement proper deallocation in destructor

ORBPathStorage.cpp

• Update ORBPathStorageGetCGPath with CF_RETURNS_NOT_RETAINED

Tests

• Add PathStorageTests for Storage class