feat(FormInput): add autoFocus to FormInput

[nating]

Adds autoFocus prop to the FormInput component 👍😎

[AaronCoplan]

Hey @nating , thanks for contributing! This looks good - would you mind just uploading a screenshot of it working? After that it'll be good to merge

[nating]

Sure, @AaronCoplan ! I tested it already but will get round to uploading a screenshot of the testing later on today 👌

[nating]

@AaronCoplan , the following GIF demonstrates:

1. Page with no FormInputs with the autoFocus property, none focus automatically when page is refreshed.
2. One FormInput element is given the autoFocus property.
3. When the browser is in context and the page is refreshed, the FormInput element with the autoFocus property is focused automatically.
4. A different FormInput element is given the autoFocus property.
5. The autoFocus also works with this other FormInput element.

[AaronCoplan]

Awesome! Thanks for the thorough demo!

[jonthomp]

🎉 This PR is included in version 1.24.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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