[Enhancement] Benchmark support grpc

### Before Creating the Enhancement Request

- [x] I have confirmed that this should be classified as an enhancement rather than a bug/feature.

### Summary

Benchmark support grpc client.

### Motivation

Currently benchmark doesn't support grpc client.

### Describe the Solution You'd Like

Implement grpc benchmark with Java SDK, support print stats and shutdown also.

### Describe Alternatives You've Considered

Nothing special

### Additional Context

_No response_

Start by locating the benchmark implementation and the Java SDK client integrations, then compare how existing clients print statistics and shut down. Add gRPC client benchmark support with those behaviors and verify it through the repository’s benchmark or Java test commands.

Written by the indexing model from the issue text.