New module by @tedder for handling granting/revoking access to KMS secrets.
For example:
```
- name: grant user-style access to production secrets
kms:
args:
mode: grant
key_alias: "alias/my_production_secrets"
role_name: "prod-appServerRole-1R5AQG2BSEL6L"
grant_types: "role,role grant"
```
