Draft: Sauteed Onions planning - 2023.Q4

This merge request aims to create a concrete roadmap to have Sauteed Onions implemented as a method for Onion Services address translation.

It can be the or part of an "Onion Names" draft plan, addressing the following Tor strategic Key Result for 2023:

Goal 2 (product) - Objective 2 (any person on the planet be able to use Tor to access any online service) - KR 1 - [...] onion names plan draft is concluded.

Closes #16 (closed)