cli: show subcommand-specific help #4173
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Previous implementation didn't take into account that 2nd and 3rd level commands might have the same name, so we can't use it to identify a proper parser. Now we use cmd class instead, which is reliable.
Fixes #4043
❗ I have followed the Contributing to DVC checklist.
📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.
❌ I will check DeepSource, CodeClimate, and other sanity checks below. (We consider them recommendatory and don't expect everything to be addressed. Please fix things that actually improve code or fix bugs.)
Thank you for the contribution - we'll try to review it as soon as possible. 🙏