Add classes which inherit from a class to the class hierarchy even if in another package

[Gerrit0]

Search Terms

hierarchy, packages

Problem

In the case where a monorepo has a base class in one package, and child classes in another package, TypeDoc will not link them together. The base class will be listed as a parent, but won't list children classes. Ideally, both link directions should be included in the documentation.

Ref: #2416.

Suggested Solution

Review extendedTypes / implementedTypes on project revival, and add classes to the appropriate arrays then.