Fix sorting of installed-packages column under NativeAOT

[Gabriel Dufresne (GabrielDuf)]

This pull request improves sorting functionality for package lists, particularly to ensure compatibility with NativeAOT release builds by avoiding reflection-based sorting. The changes introduce a strongly-typed comparer for both manual and DataGrid column sorting, ensuring consistent and reliable sorting behavior across the UI.

Sorting improvements for package lists:

• Refactored the ApplyToList method in PackageCollections.cs to use a strongly-typed comparer, ensuring that sorting is consistent and supports semantic version comparison for package versions. This replaces the previous string-based key sorting for version fields.
• Added a static Compare method and updated GetSortKey to be static and accept a sorter parameter, supporting more flexible and accurate sorting logic.
• Introduced the GetColumnComparer method to provide a reflection-free comparer for DataGrid's native column sorting, supporting AOT-safe builds.

UI integration for AOT-safe DataGrid sorting:

• Updated AbstractPackagesPage.axaml.cs to assign a strongly-typed CustomSortComparer to each sortable DataGrid column, and explicitly set CanUserSort to true, ensuring column header clicks trigger sorting even in NativeAOT builds.

General code maintenance:

• Added a missing using System.Collections; directive in PackageCollections.cs to support the new comparer implementation.