Add plugin for setting logging console

So that we are not tied to tqdm.

src/ocrmypdf/pluginspec.py

@@ -8,6 +8,7 @@
 from abc import ABC, abstractmethod, abstractstaticmethod
 from argparse import ArgumentParser, Namespace
 from collections import namedtuple
+from logging import Handler
 from pathlib import Path
 from typing import TYPE_CHECKING, AbstractSet, Callable, Iterable, List, Optional
 
@@ -27,6 +28,11 @@ hookspec = pluggy.HookspecMarker('ocrmypdf')
 # pylint: disable=unused-argument
 
 
+@hookspec
+def get_logging_console() -> Handler:
+    """Returns a logging handler. Should be configured to handle progress bars."""
+
+
 @hookspec
 def add_options(parser: ArgumentParser) -> None:
     """Allows the plugin to add its own command line and API arguments.