Implement native inventory manager workflows (#62)

crates/libremetaverse/src/inventory.rs

@@ -1462,6 +1462,16 @@ impl Inventory {
             .and_then(|value| value.clone_as::<T>()))
     }
 
+    /// Returns the shared item portion regardless of the concrete inventory
+    /// subclass stored for the UUID.
+    pub(crate) fn native_item_value(&self, uuid: UUID) -> Option<InventoryItem> {
+        read(&self.inner.state)
+            .items
+            .get(&uuid)
+            .and_then(InventoryNode::value)
+            .and_then(|value| value.item().cloned())
+    }
+
     pub fn try_get_value_with_uuid_inventory_base(
         &self,
         uuid: UUID,