Add more IAM actions

[dnmfarrell]

We have iam/s3.pl, we could use the actions for other AWS services like DynamDB etc. Each service's actions should get its own file, e.g. iam/dynamodb.pl so they can be loaded on-demand.

[dnmfarrell]

These can be generated from
https://awspolicygen.s3.amazonaws.com/js/policies.js

[dnmfarrell]

Or even
https://www.awsiamactions.io/json

[dnmfarrell]

Pausing this for now, I think it would be better to go deep and add the other features ticketed in #2 before expanding the services used.