THRIFT-5849: Expose createClient in browser version of nodejs package

`createClient` is exposed in a nodejs context, but not for browsers. Even though this is the same function as `createWsClient`, `createHttpClient`, etc, it seems odd to use these for custom connection types. Moreover, it is beneficial for the browser and nodejs interface to be as similar as possible.

lib/nodejs/lib/thrift/browser.js

@@ -33,6 +33,8 @@ exports.OhosConnection = ohosConnection.OhosConnection;
 exports.createOhosConnection = ohosConnection.createOhosConnection;
 exports.createOhosClient = ohosConnection.createOhosClient;
 
+exports.createClient = require('./create_client');
+
 exports.Int64 = require('node-int64');
 exports.Q = require('q');