Support python direct call _parse_args or run

For example:
```
>>> from podman_compose import podman_compose
>>> podman_compose._parse_args(['version'])
>>> podman_compose.run(['help'])
```

Signed-off-by: Mingzhe Zou <zoumingzhe@qq.com>

podman_compose.py

@@ -22,6 +22,8 @@
 import random
 import json
 import glob
+from typing import Optional
+from typing import Sequence
 
 from threading import Thread
 
@@ -1463,9 +1465,9 @@ def get_podman_args(self, cmd):
  xargs.extend(shlex.split(args))
  return xargs
 
- def run(self):
+ def run(self, argv: Optional[Sequence[str]] = None):
  log("podman-compose version: " + __version__)
- args = self._parse_args()
+ args = self._parse_args(argv)
  podman_path = args.podman_path
  if podman_path != "podman":
  if os.path.isfile(podman_path) and os.access(podman_path, os.X_OK):
@@ -1773,7 +1775,7 @@ def _resolve_profiles(self, defined_services, requested_profiles=None):
  services[name] = config
  return services
 
- def _parse_args(self):
+ def _parse_args(self, argv: Optional[Sequence[str]] = None):
  parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
  self._init_global_parser(parser)
  subparsers = parser.add_subparsers(title="command", dest="command")
@@ -1784,7 +1786,7 @@ def _parse_args(self):
  ) # pylint: disable=protected-access
  for cmd_parser in cmd._parse_args: # pylint: disable=protected-access
  cmd_parser(subparser)
- self.global_args = parser.parse_args()
+ self.global_args = parser.parse_args(argv)
  if self.global_args.version:
  self.global_args.command = "version"
  if not self.global_args.command or self.global_args.command == "help":