Implement AlignWidget, SizeWidget, and WidthWidget

[rboixaderg]

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The Volto Team has suspended its review of new pull requests from first-time contributors until the release of Plone 7, which is preliminarily scheduled for the second quarter of 2026.
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• I signed and returned the Plone Contributor Agreement, and received and accepted an invitation to join a team in the Plone GitHub organization.
• I verified there aren't other open pull requests for the same change.
• I followed the guidelines in Contributing to Volto.
• I succesfully ran code linting checks on my changes locally.
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If your pull request closes an open issue, include the exact text below, immediately followed by the issue number. When your pull request gets merged, then that issue will close automatically.

Closes #6645

[stevepiercy]

@sneridagh do we build Storybook for a PR preview? It would be nice to have. https://volto--7150.org.readthedocs.build/7150/reference/storybook.html redirects to the stable version, and maybe we don't want that.

[pnicolli]

@stevepiercy good idea, I don't know how the current build is done and I don't think I will be able to catch up this week since the sprint is almost over, so maybe opening a dedicated issue would be the best, and maybe let's put it directly on the agenda for the next volto team meeting

[stevepiercy]

@pnicolli done in #7159