chore(types): generate a d.ts file for protocol types (#2325)

This uses the `/json/protocol` endpoint to generate type definitions for the protocol.

Currently it is lacking protocol events and commands, but I will add those later.

lib/helper.js

@@ -56,7 +56,7 @@ class Helper {
   }
 
   /**
-   * @param {!Object} exceptionDetails
+   * @param {!Protocol.Runtime.ExceptionDetails} exceptionDetails
    * @return {string}
    */
   static getExceptionMessage(exceptionDetails) {
@@ -74,7 +74,7 @@ class Helper {
   }
 
   /**
-   * @param {!Object} remoteObject
+   * @param {!Protocol.Runtime.RemoteObject} remoteObject
    * @return {*}
    */
   static valueFromRemoteObject(remoteObject) {
@@ -98,7 +98,7 @@ class Helper {
 
   /**
    * @param {!Puppeteer.CDPSession} client
-   * @param {!Object} remoteObject
+   * @param {!Protocol.Runtime.RemoteObject} remoteObject
    */
   static async releaseObject(client, remoteObject) {
     if (!remoteObject.objectId)