feat: add lightweight styling to divider (backport #765)

[mergify]

This is an automatic backport of pull request #765 done by Mergify.
Cherry-pick of cd6b89a has failed:

On branch mergify/bp/release/stable/3.1/pr-765
Your branch is up to date with 'origin/release/stable/3.1'.

You are currently cherry-picking commit cd6b89a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   doc/controls-styles.md
	new file:   doc/controls/Divider.md
	modified:   doc/lightweight-styling.md
	modified:   doc/toc.yml
	modified:   src/library/Uno.Toolkit.Material/Styles/Controls/v2/Divider.xaml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   samples/Directory.Packages.props
	both modified:   src/Directory.Packages.props

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[agneszitte]

@Marc-Antoine-Soucy if you can help fix the merge conflicts for the backports, please

[agneszitte]

@Marc-Antoine-Soucy if you can help fix the merge conflicts for the backports, please

I fixed the merge conflicts