Describe the feature you'd like

Volcengine(Volcano Engine) is a cloud platform provided by ByteDance. In cloud environment, the form of placing Pods and hosts at the same network layer (VPC network) to get better performance and operability has been widely accepted. The Cilium users on Volcengine platform are calling for the ENI IPAM support just like the mode they are using on AWS and Alibaba Cloud:

• AWS ENI support #8347
• Add AlibabaCloud Operator #15160

So we would like to support the Volcengine cloud ENI IPAM in Cilium.

(Optional) Describe your proposed solution

Support for Volcengine cloud ENI IPAM will be split into several sub-tasks:

• Add Volcengine ENI IPAM fields into CiliumNode CRD. Add Volcengine ENI IPAM fields into CiliumNode CRD #34608

• Add Volcengine IPAM provider in Cilium Operator.

• Setup routing for Pod using Volcengine ENI in dataplane.

• Add Volcengine IPAM docs