Ensure all APIs in KC3 document are registered

[cmungall]

See figure 1 here: https://docs.google.com/document/d/1oAY9Abim2yMb2xffU71FThT5qBimjsJ5aORmQNy4ShA/edit?ts=5a3b8d0c

[micheldumontier]

here we need to identify responsible developers for each API.