ServiceAnnotations or similar field for Vault CRD since LoadBalancerIP is deprecated

[jpuskar]

Right now the Vault operator can use a specific IP address from metallb via the spec.LoadBalancerIP field.
This is required for those of us running on-prem clusters who have many different metallb address pools, etc.

However, this field is deprecated in k8s 1.24.

kubernetes/kubernetes#107235

Perhaps something like spec.ServiceAnnotations should be available instead so that the following pattern could be used to achieve the same purpose:

kind: Service
metadata:
    annotations:
        metallb.universe.tf/address-pool: my-vault-address-pool-name

Apologies ahead of time if I'm just confused about how this works or if missed an already-existing feature. I read through the source but Go is (not yet) my strong suit.

[github-actions]

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