[all][tc] Continuing the RBAC PTG discussion

Hello Everyone, As decided in PTG, we will continue the RBAC discussion from where we left in PTG. We will have a video call next week based on the availability of most of the interested members. Please vote your available time in below doodle vote by Thursday (or Friday morning central time). - https://doodle.com/poll/6xicntb9tu657nz7 NOTE: this is not specific to TC or people working in RBAC work but more to wider community to get feedback and finalize the direction (like what we did in PTG session). Meanwhile, feel free to review the lance's updated proposal for community-wide goal - https://review.opendev.org/c/openstack/governance/+/815158 -gmann