Add AWS SNS to Asset Inventory

[kubasobon]

Summary of your changes

Add an AWS SNS fetcher for Topics + Subscribtions.

Related Issues

Closes https://github.com/elastic/security-team/issues/9086

Checklist

• [x] I have added tests that prove my fix is effective or that my feature works
• I have added the necessary README/documentation (if appropriate)

Introducing a new rule?

no

[mergify[bot]]

This pull request does not have a backport label. Could you fix it @kubasobon? 🙏 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[bot]]

:bar_chart: Allure Report - :green_heart: No failures were reported.

Result	Count
🟥 Failed	0
🟩 Passed	359
⬜ Skipped	33

[mergify[bot]]

This pull request is now in conflicts. Could you fix it? 🙏 To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b inventory-aws-sns upstream/inventory-aws-sns
git merge upstream/main
git push upstream inventory-aws-sns