Add the possibility to pass resource and tag parameter

[martingaleano]

Expected Behavior

Requesting the chance to include resource and tag parameters for filtering resources during the integration of AWS accounts

Actual Behavior

The integration via https://github.com/DataDog/cloudformation-template/blob/master/aws_organizations/main_organizations.yaml does not have the possibility to pass filters to account resources

Specifications

• Datadog CloudFormation template version:
  AWSTemplateFormatVersion: 2010-09-09

For example, I'd like to achieve this using the stack:

[martingaleano]

A Pull Request was created #88