governance: expand use of CTC issue tracker

As the CTC grows and has representation from more time zones, we need to
embrace asynchronous decision making and rely less on the actual
meeting. This change is a proposal for that which, ironically, probably
has to be approved at a meeting.

PR-URL: https://github.com/nodejs/node/pull/8945


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Julien Gilli <jgilli@nodejs.org>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org>