Angular 16+ Support

• BREAKING redrawCanvas() does not auto-clear data anymore; clear will be called internally, but still preserving data. You can return to the previous behavior by calling clear() after redrawCanvas() if you want it.
• BREAKING clear() will call redrawCanvas() first. If you just want to clear data without redrawing, then call clear(false). This behavior is to fix issues where the pad loses the style after clearing data.
• BREAKING clear() will trigger drawEnd with the value of null, this can help with knowing when the pad got cleared.
• Adding new changeBackgroundColor(color: string) function to change the background color dynamically.
• New Demo UI and fixing broken showcase.
• Upgrade signature_pad to the latest version (5.0.4) See (Changelog)
• Support Angular 18 (Now it supports Angular >= 16; if any issues occur in the future, please report).
• Update dependencies for the project