<admin suggestions> move advisors to separate namespace

Admin::Suggestion::Capacity::Add was a value object.
Admin::Suggestion::Capacity::Add::Advisor was an advisor.

Loading the first could keep the second from auto-loading.
So, moving all of the advisors under the namespace:
Admin::Suggestion::Advisor, e.g.
Admin::Suggestion::Advisor::Capacity::Add which creates objects of type
Admin::Suggestion::Capacity::Add*
(value objects are not changing namespace, just advisors)