feat(service): add kube_service_ports metric

[nahuel11500]

What this PR does / why we need it:
Adds a simple metric kube_service_ports so that we can get details about the ports exposed by services.
How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
increases

[linux-foundation-easycla]

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This pull-request has been approved by: maxime1907, nahuel11500
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