Add enhancement proposal for egress flow in OpenShift

[bnshr]

This PR documents the enhancement proposal for OpenShift egress flow.

Epic Link - https://issues.redhat.com/browse/CNF-13586

[openshift-ci]

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[openshift-ci]

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[openshift-bot]

Inactive enhancement proposals go stale after 28d of inactivity.

See https://github.com/openshift/enhancements#life-cycle for details.

Mark the proposal as fresh by commenting /remove-lifecycle stale.
Stale proposals rot after an additional 7d of inactivity and eventually close.
Exclude this proposal from closing by commenting /lifecycle frozen.

If this proposal is safe to close now please do so with /close.

/lifecycle stale