Add FURN (fluent-ui-react-native) to Gallery

[chrisglein]

(drive by comment) If using a JS only control, the FURN Radiogroup might be an option

I love drive by comments from Saad!
You're right. And it'd be more Fluent than the cross-platform module I used (see #411). As is I provided 2 samples:

1. cross-platform module (not Fluent)
2. react-native-xaml Windows-specific (very Fluent)

FURN would solve both.

Buuuuuut.... to incorporate FURN into Gallery (Which I want to do! Will open an issue from this comment), I think we first need to address these:

• Required explicit importing of SVG (see Some necessary NPM modules are not in dependencies in package.json fluentui-react-native#2613)
• Required switching to classic runtime (see FluentUI in Expo project, pragma and pragmaFrag cannot be set when runtime is automatic fluentui-react-native#1891)
• Updates to the Windows visual theme (see this override)
  (I hit these when developing this: Add fluent-ui-react-native controls and update various visual styles chrisglein/artificial-chat#116)

Maybe we can partner up and fixing these and getting FURN in this Gallery app?

Originally posted by @chrisglein in #404 (comment)

[Saadnajmi]

@rurikoaraki fyi :)

[Saadnajmi]

@chrisglein do you know much about the whole "classic runtime" requirement? I thought by virtue of our pragmas that wasn't needed but it seems not?I couldn't find much documentation at all about this whole runtime thing.