[Feature] use --eplb_config to set eplb param (#20562)

Signed-off-by: rongfu.leng <rongfu.leng@daocloud.io>
Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Signed-off-by: rongfu.leng <lenronfu@gmail.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/config/__init__.py

@@ -33,7 +33,8 @@ from vllm.config.cache import (BlockSize, CacheConfig, CacheDType, MambaDType,
                                PrefixCachingHashAlgo)
 from vllm.config.compilation import (CompilationConfig, CompilationLevel,
                                      CUDAGraphMode, PassConfig)
-from vllm.config.parallel import DistributedExecutorBackend, ParallelConfig
+from vllm.config.parallel import (DistributedExecutorBackend, EPLBConfig,
+                                  ParallelConfig)
 from vllm.config.scheduler import SchedulerConfig, SchedulerPolicy
 from vllm.config.utils import ConfigType, config
 from vllm.logger import init_logger