model_dump: Implement "Hider" properly (#57654)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57654
I learned how to use children in React/Preact. :) Now it's not
necessary to give every hidable section its own id and synchonize the
"shown=false" with "style='display:none;'".
This also means that the hidden elements aren't rendered to the DOM
unless the hider is open.
Test Plan: Clicked around in Chrome.
Reviewed By: malfet
Differential Revision: D28531393
Pulled By: dreiss
fbshipit-source-id: bc86c823ae4b7e80c000f50c5429d89dff6ae64d
