#KT-45316 Fixed

property to default accessors for light-tree.

- Add utilities to add new attribute to ConeAttributes
- Get rid of FlexibleNullability attribute (it can be easily inferred
    for any flexible type at any moment)
- Fix determining of EnhancedNullability attribute

If it's not within a try/catch/finally, that should be an uncaught
exception path.

^KT-45327 Fixed

#KT-45052 Fixed

#KT-44802 Fixed