Viewport: Store viewport, rotation in globals

[shilman]

Closes N/A

What I did

Instead of storing the viewport & rotation in addon state, store them in globals.

This has two benefits:

1. users can now set the viewport via globals URL parameters:
   a. viewport controls device settings
   b. viewportRotated controls device orientation
2. gets us a step closer to using globals across our toolbar addons

How to test

1. Fire up a sandbox
2. Adjust the viewports in Page stories & note URL changes
3. Navigate between stories
4. Navigate to the viewport stories in the sandbox and do the same

[yannbf]

This looks really good! I think there's a bug with the viewportRotated global though.

if you navigate to:
https://62f0fd349c07f78d10b7c017-fetfklaray.chromatic.com/?path=/story/example-button--primary&globals=viewport:mobile1;viewportRotated:!true

it will remove the rotated global and leave the url like so, not loading the viewport in landscape mode:
https://62f0fd349c07f78d10b7c017-fetfklaray.chromatic.com/?path=/story/example-button--primary&globals=viewport:mobile1

[thafryer]

@shilman Anything that we can do to help get this merged?

[shilman]

closing in favor of #25321

[shilman]

@yannbf i suspect that's #25035