Add option to block only non-free javascript

[reisaraujo-miguel]

Description

I like the javascript blocking feature, but I don't need to block javascript from sites that license their code under a free license. So I think it would be useful to add an option to just block the non-free javascript from sites, like the libreJs extension does on firefox.

As an exemple, all javascript from the Electronic Frontier Foundation site is licensed under GPLv3, so I added an exception to their site to allow javascript, but the way Brave works now, I need to allow those sites that license their javascript under free licenses manually on a case-by-case basis.