feat: efficient roles & orgs lookup for a user [SC-35706]

[tvdaptible]

We want to display the organizations a user has access to in the cli, along with their roles for each org. This is roughly the structure of what we have without this change:

user = Aptible::Auth::Token.current_token(token: token).user
user.roles.each do |role| # http request to list all roles for the user
  org = role.organization # http request for this organization
  puts "#{org.name}: #{role.name} (#{role.id})"
end

Note that this is an N+1 operation, because each role.organization call in the loop does another http call to retrieve the organization. That happens even if the same organization has already been seen.

We add user.roles_with_organizations, which enables the same looping operations and only make 2 http requests. First it gets all the organizations and keeps them in a map, then it does the call to roles and preloads each role with the organization from the preloaded map. The above code can be converted to:

user = Aptible::Auth::Token.current_token(token: token).user
user.roles_with_organizations.each do |role| # 2 http requests
  org = role.organization                    # does _not_ make an http request 🎉
  puts "#{org.name}: #{role.name} (#{role.id})"
end

This will help with: aptible/aptible-cli#403

The base branch was changed.