Propose adding support organization aggregator

[rafaelprosa]

what

• Support AWS Config Aggregator being created to aggregate Org-wide (vs. fixed list of accounts)
• Optional IAM Role creation to support such, or can pass in (same as existing "iam_role" functionality)

why

• Make it easy to create Aggregator for all accounts (including newly-created ones)

references

• Here we adding AWS ORG aggregator authorization using the same approach that "rdkls" proposed in his PR on 2021, and change some little things.
• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/config_configuration_aggregator#organization_aggregation_source
• https://github.com/rdkls/terraform-aws-config/tree/support_organization_wide_aggregator

[IslamHeggy]

This is now a duplicate of this #85 merge request which is now fixed and it's addressing the same feature!

@rafaelprosa This issue should be closed! cc @aknysh

[Gowiem]

Fixed by #85