qmlls: Extend find-usages design

Current design of qmlls:find-usages leans on  having the same object semantics. However, it is hard to define "same object" in quite a few number of cases. For example if the same inline component is instantiated in a different context, where the ID is not visible, and then alias it around.

– figure out those cases and discuss with other people

– eventually come up with a new behavior or handle those cases