Add Colang commenting feature to VScode extension

[radinshayanfar]

This PR adds Colang commenting feature to VSCode extension. By pressing Ctrl + /, VSCode can automatically comment out a line or the selected block.

[drazvan]

Thanks, @radinshayanfar. If you can fix the formatting issue (see the failed tests), we can merge. You should install pre-commit and run pre-commit run --all-files.

[radinshayanfar]

Hi @drazvan - Thank you for your time. I fixed the formatting issue and it now passes the pre-commit hooks.