Add CPE X2P lookup support

Summary:
Basically a one-to-one conversion of https://www.internalfb.com/code/fbsource/[3171372e9b534c2ea0f318800cbd6de421e9d2d1]/fbcode/common/rust/cpe/src/

This is the information we need to connect to the local x2p daemon that allows us to talk to interngraph without vpn.

Reviewed By: lblasa

Differential Revision: D48562550

fbshipit-source-id: 8abff11f8ef76b16f6700eb89edabdb284306bb1

desktop/flipper-server-core/package.json

@@ -63,7 +63,9 @@
     "@types/split2": "^3.2.1",
     "@types/tmp": "^0.2.3",
     "@types/which": "^2.0.1",
-    "@types/ws": "^8.5.3"
+    "@types/ws": "^8.5.3",
+    "@types/mock-fs": "^4.13.1",
+    "mock-fs": "^5.2.0"
   },
   "peerDependencies": {},
   "scripts": {