chore: generalise reading values from meta tags

[snowystinger]

Closes

Pulled out of #10102 with tests to show what it's doing and to make the original PR smaller and easier to review

✅ 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

📝 Test Instructions:

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[rspbot]

Agent Skills Changes

Modified (2)

• react-aria/skills/react-aria/references/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$
• s2/skills/react-spectrum-s2/references/react-aria/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$

Install

React Spectrum S2:

npx skills add https://d1pzu54gtk2aed.cloudfront.net/pr/7bc33c630359f05c3ed7e80bf6e97dbb5766eef4/

React Aria:

npx skills add https://d5iwopk28bdhl.cloudfront.net/pr/7bc33c630359f05c3ed7e80bf6e97dbb5766eef4/

[devongovett]

Are we going to use this for something else?

[nwidynski]

@devongovett Do you mean apart from #10102? That PR generalized it to be re-used for the interactive-widget meta value.