feat #1183  implementation of synchronous XHR requests

a new property has been added to aria.modules.RequestBeans.RequestObject and to aria.core.CfgBeans.IOAsyncRequestCfg, and the request method of aria.core.transport.BaseXHR class has been modified.
Close #1183
This test can also be synchronous, but if you call `testAsync...` the framework thinks it is asynchronous. That's why you need to call method `notifyTestEnd`. I suggest the method should be renamed