Proposal: ASIM-aligned AWS GuardDuty parser and hunting queries

I have developed and validated an ASIM-aligned parsing layer for AWS GuardDuty findings ingested through the existing Microsoft Sentinel AWS connector. The proposed contribution would extend the current AWS solution with:

- an ASIM Network Session parser (`ASimNetworkSessionAWSGuardDuty`)
- hunting queries for high-severity findings, EKS privilege escalation/credential access, and S3 public exposure
- validation against the existing `AWSGuardDuty` table schema and the current AWS S3 connector

This proposal does not replace the existing AWS connector or the existing `AWSGuardDuty - GuardDuty Alert` analytic rule. It adds structured ASIM parsing and hunting content on top of the existing `AWSGuardDuty` table. I'd welcome guidance on whether this should be folded into the existing Amazon Web Services solution or submitted as standalone content.