[Asset Inventory Poc] Fech IAM Users, Roles and Policies

[romulets]

Summary of your changes

Fetch IAM Users, Roles and Policies data for the Asset Inventory POC.

Decided to stick to what cloudbeat already fetches. It might change in the future, depending on what product requests.

Screenshot/Data

Related Issues

• Related to [Asset Inventory POC] Fetch S3 buckets #2045

[mergify]

This pull request does not have a backport label. Could you fix it @romulets? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[github-actions]

📊 Allure Report - 💚 No failures were reported.

Result	Count
🟥 Failed	0
🟩 Passed	162
⬜ Skipped	0