Add app builder API spec (#2141)

Co-authored-by: ci.datadog-api-spec <[email protected]>

Author: api-clients-generation-pipeline[bot]

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-12-16 19:15:46.680976",
-            "spec_repo_commit": "162aece5"
+            "regenerated": "2024-12-17 15:50:59.257797",
+            "spec_repo_commit": "b82d3677"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-12-16 19:15:46.695609",
-            "spec_repo_commit": "162aece5"
+            "regenerated": "2024-12-17 15:50:59.273162",
+            "spec_repo_commit": "b82d3677"
         }
     }
 }