Explicitly typed aliases in QML

In the context of QDS (and also outside of that use case, but especially for QDS), it would be helpful if aliases could specif their desired type, instead of deducing it from the right hand side.

Potential syntax (up to discussion):

property alias int: anId.property

This would help tooling which needs the actual type of the alias, e.g. to show the property editor

Semantically, we still need to decide how this should behave  if the type of the RHS doesn't match the specified type of  the alias (e.g. hard error, coercion).