Add new object_storage capabilities as advisory

Based on our analysis [1], there were several object_storage tests
available which weren't included in any interop guideline.
This commit adds those tests under a few new capabilities which
are added as advisory for now. They can be moved to required
after one cycle being under advisory. Interop WG will review
these tests for inclusion for the next guideline cycle.

[1] https://etherpad.opendev.org/p/refstack-test-analysis

Change-Id: I645423b4260c49e34523c92abe20254b11ae352c

guidelines/next.json

@@ -212,7 +212,9 @@
           "identity-v3-tokens-create",
           "identity-v3-tokens-delete"
         ],
-        "advisory": [],
+        "advisory": [
+          "objectstore-bulk"
+        ],
         "deprecated": [],
         "removed": []
       },
@@ -2034,6 +2036,33 @@
        }
       }
       },
+      "objectstore-bulk": {
+      "achievements": [
+       "deployed",
+       "tools",
+       "clients",
+       "future",
+       "complete",
+       "stable",
+       "discover",
+       "doc",
+       "foundation",
+       "atomic",
+       "proximity"
+      ],
+      "admin": false,
+      "description": "",
+      "project": "swift",
+      "required_since": "2021.07",
+      "tests": {
+       "tempest.api.object_storage.test_account_bulk.BulkTest.test_bulk_delete": {
+         "idempotent_id": "id-c075e682-0d2a-43b2-808d-4116200d736d"
+       },
+       "tempest.api.object_storage.test_account_bulk.BulkTest.test_extract_archive": {
+         "idempotent_id": "id-a407de51-1983-47cc-9f14-47c2b059413c"
+       }
+      }
+      },
       "objectstore-container-acl": {
       "achievements": [
        "deployed",