Declare every module's data; the backup holder measures it (hq ADR 0233)

Backup lines are derived from each module's data section instead of written by hand; the holder
measures declared items, reads the array under them, and deletes a retired item only after a last
restore point; the Go providers say each held consumer's size so an empty replacement is seen.

modules/minio/module.json

@@ -66,6 +66,23 @@
   "own-secrets": {
     "root": "${dir:state}/root.secret"
   },
+  "data": {
+    "own": [
+      {
+        "id": "data",
+        "path": "${dir:data}",
+        "class": "valuable",
+        "why": "every consumer's bucket and its objects"
+      }
+    ],
+    "consumers": {
+      "s3-bucket": {
+        "class": "valuable",
+        "in": "data",
+        "why": "a consumer's objects are the only copy of what it stored; a consumer that keeps something irreplaceable here says so (kept-by)"
+      }
+    }
+  },
   "resources": [
     {
       "id": "state",
@@ -155,12 +172,5 @@
         }
       }
     ]
-  },
-  "contributions": [
-    {
-      "seat": "node-backup",
-      "kind": "backup",
-      "content": "path ${dir:data}\n"
-    }
-  ]
+  }
 }