Expose CNI type features as a config-map

The console requires to know the network type capabilities to show/hide some Network Policy form fields.

As a result of https://issues.redhat.com/browse/NETOBSERV-27, this logic is implemented as a features document inside the console code. The console fetches the network type from the network operator and checks the supported features towards this document.

However, this limits the feature to admin users, as other logged-in users do not have permissions to fetch the network type.

This task aims to modify the current Cluster Network Operator to expose the network capabilities as an `sdn-public` Config Map, writeable only by the SDN, readable by any `system:authenticated` user.

Enhancement Proposal PR: https://github.com/openshift/enhancements/pull/875