Implement WebSocketServer Adapter (#5866)

* Implement WebSocketServerAdapter

* lint

* clean up

src/ParseServer.js

@@ -45,32 +45,7 @@ import { ParseGraphQLServer } from './GraphQL/ParseGraphQLServer';
 addParseCloud();
 
 // ParseServer works like a constructor of an express app.
-// The args that we understand are:
-// "analyticsAdapter": an adapter class for analytics
-// "filesAdapter": a class like GridFSBucketAdapter providing create, get,
-//                 and delete
-// "loggerAdapter": a class like WinstonLoggerAdapter providing info, error,
-//                 and query
-// "jsonLogs": log as structured JSON objects
-// "databaseURI": a uri like mongodb://localhost:27017/dbname to tell us
-//          what database this Parse API connects to.
-// "cloud": relative location to cloud code to require, or a function
-//          that is given an instance of Parse as a parameter.  Use this instance of Parse
-//          to register your cloud code hooks and functions.
-// "appId": the application id to host
-// "masterKey": the master key for requests to this app
-// "collectionPrefix": optional prefix for database collection names
-// "fileKey": optional key from Parse dashboard for supporting older files
-//            hosted by Parse
-// "clientKey": optional key from Parse dashboard
-// "dotNetKey": optional key from Parse dashboard
-// "restAPIKey": optional key from Parse dashboard
-// "webhookKey": optional key from Parse dashboard
-// "javascriptKey": optional key from Parse dashboard
-// "push": optional key from configure push
-// "sessionLength": optional length in seconds for how long Sessions should be valid for
-// "maxLimit": optional upper bound for what can be specified for the 'limit' parameter on queries
-
+// https://parseplatform.org/parse-server/api/master/ParseServerOptions.html
 class ParseServer {
   /**
    * @constructor