Implement IAM Policy Evaluation service

The purpose of the story is to implement a Policy Evaluation service, so, that before any service operation execution we run the Evaluation service and make a decision if operation could be executed or not.

TODO:

- [ ] Place all policies in etcd, so, that other applications can retrieve them and verify user/service permissions before any operation execution.
- [ ] Implement a shared module with the Policy evaluation service. I assume it will be located in the `local_cloud_iam_policy_document` module.
- [ ] Update Wiki pages with related documentation.

Here is the link to the documentation page: https://docs.aws.amazon.com/IAM/latest/UserGuide/access_policies_boundaries.html#access_policies_boundaries-eval-logic