NPEP: Add support for egress traffic control

[tssurya]

Supersedes https://github.com/kubernetes-sigs/network-policy-api/pull/86 Issue-Tracker: https://github.com/kubernetes-sigs/network-policy-api/issues/126

- NOTE: Currently there are no user stories for `Pass` action with northbound traffic
    but users will get this for free since this action is anyways supported in the API.

TODO: Figure out where to add this in our website.

[netlify[bot]]

✅ Deploy Preview for kubernetes-sigs-network-policy-api ready!

Name	Link
🔨 Latest commit	ebdabbcee5728808d78bd769c3867d2064b4a2cb
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-sigs-network-policy-api/deploys/64c8e48e8c429700085a1a95
😎 Deploy Preview	https://deploy-preview-117--kubernetes-sigs-network-policy-api.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[astoycos]

@tssurya Do we need to add any docs or a template on how/ when to make an NPEP here?

This looks really good as a start.

[astoycos]

/hold

[shaneutt]

/cc

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danwinship, tssurya

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/network-policy-api/blob/main/OWNERS)~~ [danwinship] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[tssurya]

@danwinship : I have addressed all your comments, thank you for the thorough reviews.

[astoycos]

/unhold /lgtm

Wahooo first NPEP in the books 🥳 🔥 🥇