[dev-v5] Add SortableList

[vnbaaij]

This pull request introduces a new FluentSortableList component for Blazor Fluent UI, providing a drag-and-drop sortable list powered by SortableJS. The update includes the component implementation, JavaScript interop, documentation, and a comprehensive set of usage examples demonstrating sorting, moving, cloning, filtering, disabling, drag handles, and fallback behaviors.

The most important changes are:

Component Implementation and Integration

• Added the generic FluentSortableList Blazor component, which renders a sortable list using a provided ItemTemplate and exposes event hooks for sorting and moving items. (FluentSortableList.razor)
• Introduced JavaScript interop with SortableJS to handle drag-and-drop operations, group management, filtering, cloning, drag handles, and fallback mode, and to synchronize DOM changes with Blazor state. (FluentSortableList.ts)
• Declared sortablejs as a new dependency in the project. (package.json)

Documentation

• Added thorough documentation for the new component, including usage instructions, integration steps, and detailed explanations of all parameters and events. (FluentSortableList.md)

Examples and Demos

• Added multiple example .razor files showcasing different use cases:
  • Basic sortable list
  • Moving items between lists
  • Cloning items across lists
  • Disabling sorting and restricting drop targets
  • Drag handles for item reordering
  • Filtering draggable items
  • Fallback (non-HTML5) drag-and-drop mode

Minor Improvements

• Added a pragma to suppress an analyzer warning in the data grid component to allow synchronous disposal. (FluentDataGrid.razor.cs)