Support restricting intents by service port

[netthier]

Is your feature request related to a problem? Please describe.

It's not uncommon for k8s services to expose multiple ports using the same service resource, e.g. metrics and api ports.
When generating NetworkPolicys using Otterize, one can only allow access to all ports at once, which breaks the principle of least privilege.

Describe the solution you'd like

The intents-operator should allow specifying the targeted port by name or number in ClientIntents or ProtectedServices.

Describe alternatives you've considered

Workarounds for this issue include splitting the service into services with one port each, which may not be convenient with 3rd party software, or manually deploying NetworkPolicys.

Additional context

This request was first made on Slack: https://otterizecommunity.slack.com/archives/C046SG6PRJM/p1726231851326429