Improve themes toolbar, add text flow toolbar

[tylersticka]

Overview

While working on #1576, I realized I didn't have a great method for actually testing that logical properties were applying well across different direction and writing-mode settings. The Storybook add-ons related to this seem pretty far out of date, but then I saw that this was one of the use cases for the global toolbar settings we're already using for themes. I found managing separate toolbars for direction and writing-mode a bit unwieldy, so instead I consolidated these into a "text flow" item.

Along the way, I noticed that our Theme toolbar did not include all of our themes. So I modified it to support t-alternate.

I set showName to true for both of our toolbar items to make them more obvious.

Once I made these changes, I noticed that the logical properties demo for our spacing utilities wasn't quite as useful as seeing how the different settings directly impacted stories. So I removed it.

Screenshots

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[calebeby]

@tylersticka This is probably not related to this PR, but I noticed that in the spacing stories, the text is white-on-white when the theme is set to dark or dark-alt:

[tylersticka]

This is probably not related to this PR, but I noticed that in the spacing stories, the text is white-on-white when the theme is set to dark or dark-alt:

Yeah, those demos aren't really using any of our components, and the bespoke demo CSS isn't themed. So not related to this PR, but thanks for calling out!