Tree widget: Parent / child elements visibility controls in `next` branch

[JonasDov]

The changes are already in master, but it has to be done separately from https://github.com/iTwin/viewer-components-react/pull/1511. This change requires updating models/categories/classifications tree visibility handlers to have this functionality. Changes should be similar to what was done in https://github.com/iTwin/viewer-components-react/pull/1477