feat(trigger): add suspend/timeslice layers and workflow CFS scheduler

- add suspend, timeslice, and trigger post engine layers
- introduce CFS workflow scheduler tasks and supporting entities
- update async workflow, trigger, and webhook services to wire in the new scheduling flow

api/configs/feature/__init__.py

@@ -185,6 +185,22 @@ class TriggerConfig(BaseSettings):
     )
 
 
+class AsyncWorkflowConfig(BaseSettings):
+    """
+    Configuration for async workflow
+    """
+
+    ASYNC_WORKFLOW_SCHEDULER_GRANULARITY: int = Field(
+        description="Granularity for async workflow scheduler, "
+        "sometime, few users could block the queue due to some time-consuming tasks, "
+        "to avoid this, workflow can be suspended if needed, to achieve"
+        "this, a time-based checker is required, every granularity seconds, "
+        "the checker will check the workflow queue and suspend the workflow",
+        default=1,
+        ge=1,
+    )
+
+
 class PluginConfig(BaseSettings):
     """
     Plugin configs
@@ -1165,6 +1181,7 @@ class FeatureConfig(
     BillingConfig,
     CodeExecutionSandboxConfig,
     TriggerConfig,
+    AsyncWorkflowConfig,
     PluginConfig,
     MarketplaceConfig,
     DataSetConfig,