Support allow-forever option in per-origin noscript settings

[bsclifton]

Carried over from brave/browser-laptop#9307 (this functionality was missing from browser-laptop/Muon) and requested by @Jacalz:

It would be great to have an option to allow certain scripts forever or to always have the browser to remember wich scripts I want blocked on a specific site. And having the option in here:

Originaly posted from community: https://community.brave.com/t/allow-scripts-dropdown-in-address-bar-should-have-an-allow-forever-option/3141
but I would also love this 👍

The UI for shields looks a little different now (per redesign by @karenkliu and team)
cc: @tomlowenthal for triage

[DaveA-W]

+1

[davidhfo]

+1

[Brave-Matt]

+1 community:
https://community.brave.com/t/no-more-saving-shield-preferences-per-site-re-open-nov-2018-posting/69622/3

[bsclifton]

+1 from @snives via #5705

Description

Using Brave Shields, enabling script blocking, and then selecting the mix of scripts I wish to allow, does not permanently remember this selection for this website. In effect, the site is broken without enabling a certain set of scripts, thus because brave only remembers these settings "one time", the site will always be broken (unless I disable all script blocking of course, which is not what I want).

Expectation

My expectation and desire is that it DOES remember these settings permanently for this website.