1. Proposed title of this feature request
Add ICMP support to Network Policies

2. What is the nature and description of the request?
Add ICMP as possible protocol to be used in Network Policies. Here after a possible example of what is expected by my customer

spec:
  egress:
    - to:
      - ipBlock:
        cidr: 1.2.3.4/24
      ports:
      - protocol: icmp

As of today, it is not possible to use ICMP as a valid protocole in Network Policy rules.
Kubernetes API Networking types.go

3. Why does the customer need this? (List the business requirements here)
Security team on customer side asked for ICMP packets to be filtered like on any other network routers.

4. List any affected packages or components.
ovn-kubernetes