docs(storybook): add text direction auto/ltr/rtl switcher

[tay1orjones]

Closes #13620

This PR improves our storybook toolbar to have a Text direction toolbar item that influences the dir attribute on the html element that wraps the story.

Changelog

New

• Add a Text direction toolbar item to storybook

Changed

• Provide a title for our custom toolbar items in storybook to prevent confusion and improve discoverability
• add dev :: prefix for toolbar items that are only visible in dev

Testing / Reviewing

• Go to a tile story, select rtl or ltr.
• The component should reflow to display properly when rtl vs ltr is selected thanks to recent work in fix(tile): support rtl direction #14441
• Other components that have been updated to use logical properties should also render appropriately as it switches.

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[andreancardona]

Tested and looks good! So cool 😎

[alisonjoseph]

🔥 Thanks for adding this!