fix(structuredlist): expose isCondensed and isFlush props

[tay1orjones]

Closes #11432

Originally surfaced in slack

Changelog

New

• Expose isCondensed and isFlush props for StructuredListWrapper
• Add tests for these props

Changed

• Update playground story to have controls for these props

Testing / Reviewing

• Look at the structuredlist playground story, try isFlush and isCondensed and selection props and ensure they all interact together fine without defects.

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[tay1orjones]

Have been notified there's an additional fix needed - the focus states aren't showing up on the rows. Will investigate and update this PR.

[tay1orjones]

Rows not getting focus when clicked is the expected interaction. (#8172 (comment), #8172 (comment))

They do get focus when tabbed into though and can be changed via up and down arrows. So there's nothing more to address here. Marking as ready for review.