refactor: migrate AccountTreeController to @metamask/messenger

Author: mikesposito

packages/account-tree-controller/package.json

@@ -48,6 +48,7 @@
   },
   "dependencies": {
     "@metamask/base-controller": "^8.2.0",
+    "@metamask/messenger": "^0.1.0",
     "@metamask/snaps-sdk": "^9.0.0",
     "@metamask/snaps-utils": "^11.0.0",
     "lodash": "^4.17.21"