feat(SideNav): add header menu button functionality at desktop

[alisonjoseph]

Closes carbon-design-system/carbon#18492

Changelog

• update example code (what shows up in stackblitz once published)
• update overview page in storybook
• add default shell story with theme component and demo content
• isolate sidenav story
• add new isCollapsible prop to SideNav
• copy over tests from @carbon/react for SideNav
• Commented out 2 failing tests - will look at separately, shouldn't block this
• add basic test for new prop

Testing / Reviewing

Test hamburger functionality in Default story th

@oliviaflory do we want the overlay, currently by default it does pop up but I can make it configurable if needed.

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[emyarod]

looks good to me!

[IgnacioBecerra]

LGTM!! Thanks @alisonjoseph!