Bug/py compatibility

[AvinashYerra]

This PR fixes the issue #5639

• Added 'parse_expand() converter function to parse the --expand argument
• Updated @argument("--expand", type=parse_expand, ...) to use the converter function
• The converter handles:
  • "true" → True (boolean)
  • "false"→ False (boolean)
  • Comma-separated values → List[str]

[CLAassistant]

All committers have signed the CLA.

[argument]

OK!

…

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[mpreusse]

Will this be merged at some point? I'm running into the same 3.14 issues

[StuffbyYuki]

@mpreusse Looking at this this week

[StuffbyYuki]

@AvinashYerra Can you add DCO checks on your commits?