Adapt api-extractor to allow generating documentation from re-exported types

[pgayvallet]

With #76874, we started to move some base types from core to packages. However api-extractor does not generate documentation for re-exported type, causing core documentation to be incomplete, and links to types moved to packages to be broken.

We need to find a way to allow this. One option would probably be to contribute upstream.

More context: #76874 (comment)

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[joshdover]

@stacey-gammon Do you think we should close this issue now that we're moving forward with the ts-morph implementation?

[pgayvallet]

Given we're planning on getting rid of api-extractor for Core's generated doc, I'll go ahead and close this.