Revert "drop ascend scheduler" (#4580)

Reverts vllm-project/vllm-ascend#4498
- vLLM version: v0.11.2
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.2

vllm_ascend/ascend_config.py

@@ -39,6 +39,11 @@ class AscendConfig:
         self.torchair_graph_config = TorchairGraphConfig(
             torchair_graph_config, vllm_config, additional_config)
 
+        ascend_scheduler_config = additional_config.get(
+            "ascend_scheduler_config", {})
+        self.ascend_scheduler_config = AscendSchedulerConfig(
+            ascend_scheduler_config)
+
         # Dump / PrecisionDebugger configuration
         dump_config_path = additional_config.get("dump_config", None)
         self.dump_config = DumpConfig(dump_config_path)
@@ -215,6 +220,20 @@ class TorchairGraphConfig:
             )
 
 
+class AscendSchedulerConfig:
+    """
+    Configuration Object for ascend_scheduler_config from additional_config
+    """
+
+    def __init__(self, ascend_scheduler_config: dict):
+        self.enabled = ascend_scheduler_config.get("enabled", False)
+        # Ascend scheduler is based on vllm v0 scheduler, so we should support
+        # all vllm v0 scheduler configs as well.
+        for k, v in ascend_scheduler_config.items():
+            if not hasattr(self, k):
+                setattr(self, k, v)
+
+
 class DumpConfig:
     """
     Configuration object for dump/PrecisionDebugger settings.