Add an example that shows how NSE's IPAM Policies work

[NikitaSkrynnik]

Description

This PR adds an example that shows how NSE's IPAM policies can be used to control connection's ip_context.

Issue link

1. https://github.com/networkservicemesh/deployments-k8s/issues/11787
2. https://github.com/networkservicemesh/deployments-k8s/issues/12121

How Has This Been Tested?

• [ ] Added unit testing to cover
• [x] Tested manually
• [x] Tested by integration testing
• [ ] Have not tested

Types of changes

• [ ] Bug fix
• [x] New functionality
• [ ] Documentation
• [ ] Refactoring
• [ ] CI