feat: implement SSE for data source node processing and completion events, replacing previous run methods

web/types/pipeline.tsx

@@ -0,0 +1,17 @@
+export type DataSourceNodeProcessingResponse = {
+  event: 'datasource_processing'
+  total: number
+  completed: number
+}
+
+export type DataSourceNodeError = {
+  event: 'datasource_error'
+  message: string
+  code?: string
+}
+
+export type DataSourceNodeCompletedResponse = {
+  event: 'datasource_completed'
+  data: any
+  time_consuming?: number
+}