feat: add support for `multiPositional`

[kricsleo]

resolves #115 resolves #80

This PR adds support for multiPositional.

[codecov[bot]]

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Additional details and impacted files

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  Coverage        ?   94.17%           
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  Files           ?        7           
  Lines           ?      532           
  Branches        ?      175           
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  Hits            ?      501           
  Misses          ?       31           
  Partials        ?        0           

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[valadaptive]

/cc @pi0: this has been sitting since April, and I wanted to make sure it was on your radar. I'm working on a CLI app that could make use of this feature and found my way to this PR.