[Azure] Add websites asset type

[orouz]

adds a new asset type to be fetched for evaluation, goes with elastic/csp-security-policies#316

[mergify]

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

❌ No tests were run ❌

[orouz]

IMO we should inline all the asset type strings and generate the sub type (or type) from the string itself. same as we did in GCP

[mergify]

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 azure_websites upstream/azure_websites
git merge upstream/main
git push upstream azure_websites

[mergify]

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 azure_websites upstream/azure_websites
git merge upstream/main
git push upstream azure_websites