[enhancement]: deprecate underscores in CLI flags

[ebr]

Is there an existing issue for this?

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What should this feature add?

mentioned in Discord

It is unusual for a script to use an underscore in a -- parameter. I was expecting --root-dir to work, but it has to be --root_dir

This has been mentioned by a few other users.

Add the hyphenated syntax to args while retaining old syntax for backwards compatibility.

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