Add support for organization aggregator

[IslamHeggy]

what

• Extended the module functionality to include organization wide aggregator
• Add the ability to create/pass new IAM role for the organization aggregator
• Handled default IAM role cases vs organization aggregator IAM role. So they don't depend on each other

why

• The current default way is attaching accounts using account ids and there is no way to use organization wide aggregator and it's really hard to maintain large number of accounts when using organizations.

references

• I used organization aggregation argument of the aws_config_configuration_aggregator provider to add the functionality.

• I checked this stale PR and decided to reinvent the wheel as it has been a while since it was opened

[aknysh]

@IslamHeggy thanks for the PR

Please address the error

[tflint] reported by reviewdog 🐶
data "aws_iam_policy_document" "config_organization_aggregator_policy" is declared but not used

and run the following commands and commit the changes

make init
make github/init
make readme

Thanks

[aknysh]

please see comments

[IslamHeggy]

please see comments

I addressed all your comments in my recent commit, please let me know if anything else is needed here @aknysh

[aknysh]

@IslamHeggy sorry, please run again

make init
make github/init
make readme

[IslamHeggy]

@IslamHeggy sorry, please run again

make init
make github/init
make readme

That's okay, I updated the documentation @aknysh

[aknysh]

/terratest

[aknysh]

thanks @IslamHeggy