Deprecate AddedByUsesAware

This interface's sole method, isAddedByUses(), is used only by Binding runtime and obsolete components. We expose enough information through DeclaredStatement and EffectiveStatement so that comparing their children can reconstruct this boolean. Parser-side of this cost is that YANGTOOLS-1067 cannot reuse substatements of a grouping in their first instantiation site, leading to a lot of objects which differ in only one bit.
Deprecate this interface to call users to action.