fix: prevent false drift in VPCEndpoint and SecurityGroup resources

[michaelhtm]

Description of changes:
VPCEndpoint: Add is_iam_policy for PolicyDocument (semantic JSON compare
instead of string compare), add late_initialize for ServiceRegion.

SecurityGroup: Replace order-sensitive DeepEqual for IngressRules/
EgressRules with set-based containsRule comparison via delta_pre_compare
hook, preventing false diffs from rule ordering differences.

Resolves aws-controllers-k8s/community#2695
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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Test name	Commit	Details	Required	Rerun command
ec2-kind-e2e	4b26006	link	true	/test ec2-kind-e2e

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