add indexes for sqlite inventory

OpenSim/Data/SQLite/Resources/002_InventoryStore.sql

@@ -0,0 +1,8 @@
+BEGIN TRANSACTION;
+
+create index inventoryfolders_agentid on inventoryfolders(agentid);
+create index inventoryfolders_parentid on inventoryfolders(parentid);
+create index inventoryitems_parentfolderid on inventoryitems(parentfolderid);
+create index inventoryitems_avatarid on inventoryitems(avatarid);
+
+COMMIT;