Feat: add support for fallback ngw IPs (BYOIP for fallback NGW) #163
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Summary
Adds support for explicitly providing EIP allocation IDs for fallback NAT Gateways.
Changes
fallback_nat_eip_allocation_idsMotivation
Allows users to reuse pre-allocated EIPs (e.g., allow-listed addresses) for fallback NAT Gateways, ensuring predictable IPs and avoiding unnecessary EIP creation or simplify whitelisting of new addressea, CIDR blocks.