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Add EC2 and ELB resource fields for FedRAMP asset inventory

Follow-up to InfoSec review of the missing-AWS-fields PR. Surfaces
additional EC2 and ELB fields into entity.attributes (non-ECS,
UpperCamelCase) so the Asset Discovery integration can replace the
custom AWS CLI scripts.

EC2:
- ImageId, Platform, VpcId, SubnetId, State, RoleArn from the instance
- Owner, CostCenter looked up case-insensitively from tags

ELB v1 + v2:
- LoadBalancerType (v2 real type; v1 "classic"), AccountID
- State (v2 only; classic ELB has no state field)
- IPAddresses (NLB static IPs; ALB/classic are DNS-only)
- OwnerTag via new DescribeTags plumbing on both providers