Update NSM-related D-Bus interfaces and codegen

Update NSM-related D-Bus interfaces and codegen

Change all instances of conti to contiautomotive in bus names, object
paths and interfaces.

Change shutdown consumers' interface to
com.contiautomotive.NodeStateManager.LifeCycleConsumer and replace the
Shutdown() method with a LifecycleRequest() method which takes arguments
"Request", "RequestId" and returns "ErrorCode".

In addition, this commit removes the ShutdownConsumerService object and
handles all shutdown consumers directly in the legacy app handler.