Advanced Paste additional customizations and PhiSilica provider

[khmyznikov]

This pull request introduces significant improvements to the Advanced Paste module’s packaging, signing, and installation process. The most important changes are the migration of Advanced Paste to a self-contained MSIX package (with package identity), robust CI/CD signing and installer integration, and updated documentation and build configurations to support these changes.

Advanced Paste MSIX packaging and installer integration:

• Migrated Advanced Paste to a self-contained MSIX package, including its dependencies, and ensured the MSIX is built and output to WinUI3Apps/AdvancedPaste/. The WiX installer now deploys and registers the MSIX package and its dependencies, with custom actions to install and uninstall the package during setup/uninstall.

• Added a new ESRP signing policy and CI pipeline steps to locate, unpack, sign, and re-pack the Advanced Paste MSIX and its contents. This ensures the MSIX and its DLLs/EXEs are properly signed before distribution.
  Build and configuration updates:

• Updated build templates and props to support Advanced Paste versioning and new MSIX output location. This includes adding versioning steps, updating launch configurations, and importing new build properties for Phi Silica support.

• Upgraded Windows App SDK NuGet package versions for Advanced Paste and related projects.

Documentation improvements:

• Expanded developer documentation to explain the new MSIX packaging, debugging, and Phi Silica (Windows AI) integration, including how the installer and runtime registration work, and how the Settings UI queries Advanced Paste for AI model availability.

These changes together enable Advanced Paste to use Windows AI APIs (Phi Silica) via native package identity, simplify deployment and signing, and improve maintainability and developer experience.

[khmyznikov]

https://microsoft.visualstudio.com/Dart/_build/results?buildId=146714352&view=results

[github-actions]

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