feat: add billing and usage domain cores

contracts/usage/core-v1.json

@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "timeZone": "Asia/Shanghai",
+  "excluded": { "sources": ["api"], "providers": ["mock"] },
+  "dedupeKey": "jobId",
+  "scopes": {
+    "personal": "accountId",
+    "organization_admin": "organizationId",
+    "super_admin": "all"
+  },
+  "organizationAdminRedaction": ["accountUsername"]
+}