feat(Stepper): Additions to the Stepper component for accessibility compliance. The 'aria-current' attribute now reads 'step' when active, the DOM structure has been changed to a UL LI layout, and when labels are hidden, the screenreader sees the step state for each step label.

[chris-cedrone-cengage]

Issue: # 1143

What I did

• Changed aria-current to read "step" when active.
• Converted to UL LI structure for the component layout.
• Added the state for each step when labels are hidden.

Checklist

• [X] changeset has been added
• [X] Pull request description is descriptive
• [N/A] I have made corresponding changes to the documentation
• [X] New and existing unit tests pass locally with my changes
• [N/A] I have added tests that prove my fix is effective or that my feature works

How to test

• Make sure aria-current reads "step".
• Verify in DOM that the UL LI structure looks sufficient.
• Ensure screen reader can read the step state after the label when labels are hidden.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d1960e237ceb92bdd2d491ba968828e674abe4ac

The changes in this PR will be included in the next version bump.

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