Feature: support multiple package managers

[goestav]

This pull request adds support for other package managers like pnpm and yarn.

Closes #173

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Latest commit: b8d7fa0a9e57df01fe4071cdd949437b26990216

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| Name | Type | | --------------------- | ----- | | @arethetypeswrong/cli | Minor |

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[goestav]

~~Hello @andrewbranch, you're correct about pnpm not supporting custom filenames for tarballs. I did mention that in the comment here but maybe I should've made that clear in the merge request description as well. Yarn does support it however.~~

~~What do you think about an option that lets you specify the package manager manually for the pack command? Like for example: attw --pack . --package-manager pnpm (or attw --pack . -m pnpm for short). The default value should be npm so it doesn't break the workflow of others.~~

Edit: it turns my issue from #173 was relevant to this npm bug, for some reason I'm not experiencing the problem anymore now.