v1.9.0

1. Added sass: custom configuration option for cleaner integration with bslib.
2. Introduced format_js() and format_sass() powered by prettier.
   • Note: lint_js() and lint_sass() report styling errors. They might complain about formatting done with format_js() and format_sass() functions; however, we haven't spotted any issues so far. If you face any problems with this, then please raise an issue on GitHub