Revamp debug logging

Summary:
- Switch namespace prefix from `ReactNativePackager:` to `RNP:`
- Add logging for handled requests
- Log transform cache key
- Add logging for transform cache hits/misses

Reviewed By: jeanlauliac

Differential Revision: D4377867

fbshipit-source-id: 9ec2060432f8c5e68561d3fe8ec7127f76c4a081

local-cli/server/util/inspectorProxy.js

@@ -45,7 +45,7 @@ const querystring = require('querystring');
 const parseUrl = require('url').parse;
 const WebSocket = require('ws');
 
-const debug = require('debug')('ReactNativePackager:InspectorProxy');
+const debug = require('debug')('RNP:InspectorProxy');
 const launchChrome = require('./launchChrome');
 
 type DevicePage = {
@@ -456,7 +456,7 @@ function attachToServer(server: http.Server, pathPrefix: string): InspectorProxy
 
 if (!module.parent) {
   console.info('Starting server');
-  process.env.DEBUG = 'ReactNativePackager:Inspector';
+  process.env.DEBUG = 'RNP:Inspector';
   const serverInstance = http.createServer().listen(
     8081,
     'localhost',