Add Reviewer Teams

[ksatirli]

To make code reviews simpler, it would be useful to have aliases for reviewer teams.

The first two teams that come to mind:

• Nomad / Nomad Pack
• Terraform

These teams should be built around var.organization_members. The list(string) should turn into a list of objects, where each name also gets assigned an optional skills field (of type list(string)).

This list can then be iterated in teams.tf and mapped acccordingly.