Async Core API: Inventories

[btoron]

Implement async versions of standalone inventory operations (11 methods total).

Methods include: create_inventory, get_inventory, update_inventory, delete_inventory, get_inventory_property, set_inventory_property, delete_inventory_property, undo_install, undo_deinstall, install, deinstall.

See planned methods list in /Users/borja.toron/.claude/plans/magical-bouncing-curry.md