feat: add ability to position resizer button

[b-zurg]

This should be fairly easy to do by allowing the user to control the flex values of an item before and after the button.

This can be simplified into an offset which will add the flex value to one side or the other. The option would be provided through the collapseOptions prop

[github-actions]

🎉 This issue has been resolved in version 1.3.0 🎉

The release is available on:

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

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