Enhance STBaseView and STRefreshControl with improved internal state management and safe area handling

- Introduced lazy initialization for scrollView and contentView in STBaseView to optimize performance.
- Added internal flags to track the creation status of scrollView and tableView, allowing for better configuration management.
- Updated safe area handling in STBaseView to ensure proper content inset adjustments during layout changes.
- Enhanced STRefreshHeaderView and STLoadMoreFooterView with new methods for recalibrating original insets based on safe area changes, preventing layout issues during refresh operations.
- Implemented safeguards against KVO loops when adjusting content insets in both refresh control classes.

Author: i-stack