feat: Embedding (backport #1691)

[mergify]

This is an automatic backport of pull request #1691 done by Mergify.
Cherry-pick of e232b04 has failed:

On branch mergify/bp/legacy/2x/pr-1691
Your branch is ahead of 'origin/legacy/2x' by 55 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit e232b04b.
  (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:   samples/MauiEmbedding/Directory.Packages.props
	modified:   samples/MauiEmbedding/MauiEmbedding/Presentation/MauiControlsPage.xaml.cs

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

Cherry-pick of 44da710 has failed:

On branch mergify/bp/legacy/2x/pr-1691
Your branch is ahead of 'origin/legacy/2x' by 76 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 44da710f.
  (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:   samples/MauiEmbedding/Directory.Packages.props
	modified:   src/Uno.Extensions-packageonly.slnf

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   samples/Playground/Directory.Packages.props
	both modified:   src/Directory.Packages.props
	both modified:   src/Uno.Extensions.RuntimeTests/Uno.Extensions.RuntimeTests.Mobile/Uno.Extensions.RuntimeTests.Mobile.csproj
	both modified:   src/Uno.Extensions.RuntimeTests/Uno.Extensions.RuntimeTests.Skia.Gtk/Uno.Extensions.RuntimeTests.Skia.Gtk.csproj
	both modified:   src/Uno.Extensions.RuntimeTests/Uno.Extensions.RuntimeTests.Skia.Wpf/Uno.Extensions.RuntimeTests.Skia.Wpf.csproj
	both modified:   src/Uno.Extensions.RuntimeTests/Uno.Extensions.RuntimeTests.Wasm/Uno.Extensions.RuntimeTests.Wasm.csproj
	both modified:   testing/TestHarness/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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