Feature: Display current variant item name

[madsrasmussen]

Fixes #17652

This PR introduces an UmbDocumentItemDataResolver to assist in gathering context-aware names + states for document items.

This means that the resolver will return the correct name, state, and create/update dates based on the current language context.

The PR implements the resolver in the

• Document Tree Item,
• Document Collection Table Item (cards will come later),
• Document Ref Item.

What to test:

Show the correct name/state when:

• Changing the app language,
• Changing the document language variant
• Picking a document.