Bug in cli `filter` command

[Jegp]

Currently, when running the filter command from the command line, the following error appears:

$ faery input file dvs.es filter render --help
Traceback (most recent call last):
  File "/home/jens/work/faery/.venv/bin/faery", line 8, in <module>
    sys.exit(__main__.main())
             ^^^^^^^^^^^^^^^
  File "/home/jens/work/faery/python/faery/__main__.py", line 76, in main
    cli.first_block_keyword_to_command[sys.argv[1]].run(sys.argv[1:])
  File "/home/jens/work/faery/python/faery/cli/process.py", line 643, in run
    stream_wrapper.add_filter(subcommand_arguments)
  File "/home/jens/work/faery/python/faery/cli/process.py", line 522, in add_filter
    parser = filter_parser(self.stream.__class__)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jens/work/faery/python/faery/cli/process.py", line 182, in filter_parser
    name_to_filter = list_filters.class_to_name_to_filter()[stream_parent_class]
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jens/work/faery/python/faery/cli/list_filters.py", line 467, in class_to_name_to_filter
    raise Exception(
Exception: unsupported parameter type typing.Union[faery.timestamp.Time, str, NoneType] in filter regularize of <class 'faery.events_stream.EventsStream'>

We should

1. Fix the parameter type error, and
2. Introduce a unit test that ensures the filter doesn't crash