Add Support IPAM object to Allow Load Balancer or Port-forward map to floating IP Address

##### ISSUE TYPE

* Feature Idea

##### COMPONENT NAME

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UI,API,Guest Network

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##### CLOUDSTACK VERSION

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##### CONFIGURATION

##### OS / ENVIRONMENT

##### SUMMARY

When a Guest Network was created, the port forward and load balancer features only allow to be configure with pre-existing VM in same Guest Network. Sometime user will deploy self managed virtual ip address to support their application such as keepalived, MetalLB..etc. Today, the user will add a secondary NIC to the one of VM instance and then use the assigned NIC ip address to treat the virtual ip setup. Most of the time, it is unavoidable to use this appoarch when LB pool health check limit to L4 port checking.

I'm wondering if ACS can implement IPAM management abstract under guest network to allow user create IP entities which will able to include into port forwarding or Load balancer member.

##### STEPS TO REPRODUCE

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##### EXPECTED RESULTS

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##### ACTUAL RESULTS

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N/A
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El issue identifica UI, API y Guest Network como los componentes afectados, pero no nombra archivos ni tests. Empieza por rastrear los flujos de trabajo de reenvío de puertos de guest-network y de balanceo de carga. Se considera terminado cuando los usuarios pueden crear entidades IP dentro de una Guest Network y utilizarlas en asignaciones de port-forward y load-balancer.

Escrito por el modelo de indexación a partir del texto del issue.