Add MessagePackAnalyzer (#431)

Author: bdovaz

registry.json

@@ -666,6 +666,11 @@
     "listed": true,
     "version": "2.0.323"
   },
+  "MessagePackAnalyzer": {
+    "listed": true,
+    "version": "2.5.187",
+    "analyzer": true
+  },
   "MessagePipe": {
     "listed": true,
     "version": "0.0.1"
@@ -1803,4 +1808,4 @@
     "listed": true,
     "version": "0.1.0"
   }
-}
+}