Enhancement 1012 steplist

[dgrossen]

Dusting off #2832

Original PR description:

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

I took the great work @itaylor did on step list and did some of the changes that were discussed like:

• changed aria hooks to fallow same pattern, like the rest of the components passing props state ref to get the components DOM props
• added keyboard delegation for useStepList currently it's the same like for tabs but i will fallow with spectrum design to get the corect keyboard navigation behaviour
• added support for useSelectableCollection in useStepList
• moved aria-${props} out of useStepItem to StepItem to fallow the same pattern with the rest of the components

My Plan:

• revisit styling and make sure we are aligned with UX
• address some comments from @snowystinger regarding flex
• add docs
• refactor stories and add more examples

Let me know your thoughts

[dgrossen]

Closing. Merging directly into the branch instead and linking the PR