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

(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 https://github.com/microsoft/fluentui-react-native/issues/2613)
• Required switching to classic runtime (see https://github.com/microsoft/fluentui-react-native/issues/1891)
• Updates to the Windows visual theme (see this override)
  (I hit these when developing this: https://github.com/chrisglein/artificial-chat/pull/116)

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

Originally posted by @chrisglein in https://github.com/microsoft/react-native-gallery/issues/404#issuecomment-2076053883

Start by reviewing the prerequisite issues #2613 and #1891, then inspect the Windows visual-theme override referenced from artificial-chat PR #116. Done means the Gallery app incorporates FURN and addresses the explicit SVG imports, classic runtime, and Windows theme updates identified in the issue.