Fixing types. (RasaHQ#10083)

Fixed a problem with paths being processed as strings.

Co-authored-by: Matthew Summers <m.summers@rasa.com>

rasa/cli/arguments/evaluate.py

@@ -1,19 +1,20 @@
 import argparse
+from pathlib import Path
 from rasa.cli.arguments.default_arguments import add_endpoint_param, add_domain_param
 
 
 def set_markers_arguments(parser: argparse.ArgumentParser) -> None:
     """Specifies arguments for `rasa evaluate markers`."""
     parser.add_argument(
         "output_filename",
-        type=str,
+        type=Path,
         help="The filename to write the extracted markers to (CSV format).",
     )
 
     parser.add_argument(
         "--config",
         default="markers.yml",
-        type=str,
+        type=Path,
         help="The config file(s) containing marker definitions. This can be a single "
         "YAML file, or a directory that contains several files with marker "
         "definitions in it. The content of these files will be read and merged "
@@ -33,7 +34,7 @@ def set_markers_arguments(parser: argparse.ArgumentParser) -> None:
         "--stats-file-prefix",
         default="stats",
         nargs="?",
-        type=str,
+        type=Path,
         help="The common file prefix of the files where we write out the compute "
         "statistics. More precisely, the file prefix must consist of a common "
         "path plus a common file prefix, to which suffixes `-overall.csv` and "