Using UDS to improve Inference GW plugin latency

### 🚀 Feature Description and Motivation

Currently we deploy plugin(ext-proc) as a deployment in cluster, which communicates with envoy through gprc call in pod-to-pod networking, which brings external cost for different NetNS, node data transfer.

Support deploying plugin as a sidecar of envoyproxy to use UDS communitcation between containers.

### Use Case

System performance improvemnt

### Proposed Solution

_No response_

The issue names no files, tests, or entry points. Start by tracing the current ext-proc plugin deployment and Envoy gRPC communication, then determine how sidecar deployment and UDS communication should be integrated; done means the plugin runs beside Envoy and the latency improvement is demonstrated.

Written by the indexing model from the issue text.