Remote function classes and methods specification

@remote decorator

sagemaker.remote_function.client.remote

RemoteExecutor

sagemaker.remote_function.RemoteExecutor

Future

sagemaker.remote_function.client.Future

sagemaker.remote_function.client.list_futures

sagemaker.remote_function.client.get_future

CustomFileFilter

sagemaker.remote_function.custom_file_filter.CustomFileFilter