tenant CRUD operation need to be authorized

[shayts7]

Today anyone can create and delete tenants. We need to think about mechanism to manage that.

1. One option is to leave it open, but in that case we must check that the creator of a tenant is the only one that can update it and delete it. Also in this option we must limit the free resources (data in per day, storage size, etc..)
2. Other option is that tenant provision is something that a customer can only ask, and we are the team that allow it (A UI that we will supply that at the end will send request email to us)

In any case we need "admin group" that we will be part of it, even for the first option - so we will be able to do any operation on any tenant.