feat(toast): enhance toast component functionality and documentation

- Updated the Toast component to support multiple positioning options: top, bottom, top-left, top-right, bottom-left, and bottom-right.
- Improved styling with rounded corners and backdrop blur effects for better visual appeal.
- Refactored the ToastProvider to manage toast visibility and animations more effectively.
- Added comprehensive usage examples demonstrating various toast types and positions in the documentation.
- Updated registry files to include the new toast component and its dependencies.

Author: theoribbi