Add support for use of multiple regions at the same time within same account

[IvanVlasic]

Currently, mantil can create necessary infrastructure only in one region at the time. Adding support for multiple regions at the same time requires some additional work with IAM and workflow.

Since IAM is global, all roles and policies we create for the first region can't be recreated if another region is added. We need to figure out how to solve that, either have roles for each region or somehow encompass all of them in same roles.

Another question is workflow for the users through CLI. Will the new region be created through mantil setup or will mantil setup create only necessary infrastructure used by all regions and then there would be separate command that adds the rest of the infrastructure for each region, or something completely different.

[ianic]

Napravi sto je ispravno za korisnika.

IAM je globalni resurs, lambda su regionalni.
Dovoljno je da bude jedna IAM rola za sve regije.

Nemoj da koristenje cli-ja reflektira prema korisniku tu komplikaciju. To je briga mantila, da stvari kreira i kada se gasi zadnja regija u tom accountu i pobrise sve iza sebe.

[ianic]

Ja bi uid koji imamo na razini workspace, spustio na account.
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