Implement VirtualIP for ServiceImport

[tanujd11]

What would you like to be added:
Implement VirtualIP for populating ServiceImport.Spec.IPs. Need a routing mechanism for traffic to this VirtualIP from any cluster to multiple GlobalIngressIPs. The usecase here is that if someone wants service discovery and service registry mechanism through Submariner and routing mechanism through some another proxy let's say envoy. This ServiceImport can act as service registry to it. This virtualIP implementation is also part of the MCS API spec.

Why is this needed:

[github-actions]

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