Implement new identifier format for asset inventory

[romulets]

Summary of your changes

To comply with https://github.com/elastic/security-team/issues/9798 and be able to correlate multiple datasources, Asset Inventory has changed the asset field to entity field name, converted id to a list and removed the uuid earlier introduced

Related Issues

• Related https://github.com/elastic/security-team/issues/9798
• Fixes https://github.com/elastic/security-team/issues/9799
• Fixes https://github.com/elastic/security-team/issues/9823

Checklist

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

[mergify[bot]]

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[bot]]

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

Result	Count
🟥 Failed	0
🟩 Passed	359
⬜ Skipped	33