Implement support for 'kind' field from arca-cli in asset management UI

[adryledo]

Add support in arca-vscode for the new kind field introduced by arca-cli (adryledo/arca-cli#3) so the asset type is shown wherever asset type is referenced, and assets window lists are grouped by both kind and source.

Details:

• Update internal asset data structures to recognize the kind field (e.g., skill, instruction, etc.).
• Show asset kind in all UI views and tooltips displaying asset details.
• In the Assets Window, group and display assets by their kind and by their source (e.g., separate by Skill/Instruction, by source repo/org).
• Make sure kind-based grouping is reflected in sorting/filtering options if relevant.
• Update all instances where asset type information appears (dialogs, lists, popovers, etc.) to use the new field.
• Add tests for kind-based display and grouping logic.

Reference:

• arca-cli PR #3