Refactor GETINFO dir/ so that new tor/ URLs automatically become GETINFOs
The control-spec lists some tor/ URLs as GETINFO dir/ keys: https://gitweb.torproject.org/torspec.git/tree/control-spec.txt#n807 (The reference to section 4.4 in dir-spec is also wrong, it should be Appendix B.)
But some newer URLs are missing, for example, consensus-microdesc: https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n3862
We could refactor the GETINFO dir/ code to redirect all requests to the tor/ URL.