[lldb/Debugger] Rename IO handler methods to be more meaningful (NFC)

Make it clear form the method names whether they are synchronous or
asynchronous.

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -1064,7 +1064,7 @@ void ScriptInterpreterPythonImpl::ExecuteInterpreterLoop() {
 
   IOHandlerSP io_handler_sp(new IOHandlerPythonInterpreter(debugger, this));
   if (io_handler_sp) {
-    debugger.PushIOHandler(io_handler_sp);
+    debugger.RunIOHandlerAsync(io_handler_sp);
   }
 }