feat: Add stretch option to space between's alignItems property

[timogasda]

Description

This change adds a new option of "stretch" to the alignItems property on space between.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.52%. Comparing base (82d11d6) to head (0b58a6c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4640   +/-   ##
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  Coverage   97.52%   97.52%           
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  Files         948      948           
  Lines       30363    30363           
  Branches    11077    11077           
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  Hits        29610    29610           
  Misses        706      706           
  Partials       47       47           

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[SpyZzey]

When we don't define the alignItems props, it basically falls back to "stretched" (browser default). Should we explicitly set it to "stretch" instead of relying on the implicit browser defaults?

[timogasda]

I'm not sure I understand. The default value for align-items is normal, not stretch.

[SpyZzey]

Yes, which in our case behaves like stretch (https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-items#values). Except that I missed

behaves like start on replaced absolutely-positioned boxes

which would change the behavior on rare cases were SpaceBetween has a absolutely-positioned replaced element (e.g., img, canvas, input?) as a direct child. So I think we are good, keeping it as is to ensure we don't break some niche cases.