Inheritance and override icons like in CLion

Type: Feature Request

It would be nice to have icons on lines which show the following, like in CLion:

• the method overrides another one (a hover would indicate the overridden method)
• the method is overridden somewhere (a hover would indicate all overriding methods)
• the class/struct inherits (an)other(s) (a hover would indicate all parents)
• the class/struct is inherited somewhere (a hover would indicate all childs)

This is basically the same feature request as this one but for C++.

An example on how it looks in CLion (not complete):

La issue non indica file di implementazione né test; leggi prima la richiesta correlata del language server Python (#1641) e gli entry point delle funzionalità dell’editor dell’estensione C++. Il lavoro è completato quando vengono mostrate icone di riga per override, metodi sovrascritti, ereditarietà e classi derivate, con hover che identificano i metodi o i tipi corrispondenti.