feat(List): allow overriding role prop

[johannao76]

Update List and ListItem components to move ...rest to the end of the props list during render. This allows the user to override props like the aria role (which I need in my case).

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov-io]

Codecov Report

Merging #3125 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3125   +/-   ##
=======================================
  Coverage   99.92%   99.92%           
=======================================
  Files         163      163           
  Lines        2742     2742           
=======================================
  Hits         2740     2740           
  Misses          2        2

Impacted Files	Coverage Δ
src/elements/List/List.js	100% <ø> (ø)	⬆️
src/elements/List/ListItem.js	100% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ac7cd79...63228ce. Read the comment docs.

[levithomason]

Looks great, thanks!

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[levithomason]

Released in [email protected].