Delist and Promote metallb charms

[addyess (Adam Dyess)]

@odysseus-k Made it

Review Charm for MetalLB

MetalLB offers a software network load balancing implementation that allows for LoadBalancing services in Kubernetes. Upstream documentation for MetalLB can be found at https://metallb.universe.tf/ The charm currently supports MetalLB Layer 2 mode. The official documentation for this charm and how to use it with Kubernetes can be found at MetalLB | Ubuntu. Metadata links charmhub.io: Charmhub | Deploy Metallb using Charmhub - The Open Operator Collection project repository: https://github.co…