rustdoc: (WIP) Allow the doc generation from compiled crates. #19606
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This is a work in progress and cannot be merged yet (there are several known issues). I want to gather more opinions about this feature, especially because, I came to believe that this is a lot harder than "putting a few more wires in place" and considerably delicate feature to implement.
This commit uses an existing foreign inlining facility to implement the doc generation from compiled crates. At the highest level, this is a huge hack since the metadata doesn't provide everything we need to generate docs.
Fixes #2206. Will fix #15309 once integrated with Makefile.