Add new column for benchmark run status. (#4373)

Author: qlzh727

official/benchmark/datastore/schema/benchmark_run.json

@@ -5,6 +5,12 @@
     "name": "model_id",
     "type": "STRING"
   },
+  {
+    "description": "The status of the run for the benchmark. Eg, running, failed, success",
+    "mode": "NULLABLE",
+    "name": "status",
+    "type": "STRING"
+  },
   {
     "description": "The name of the model, E.g ResNet50, LeNet-5 etc.",
     "mode": "REQUIRED",