chore(visitor): break up visitor to multiple modules

[chris-olszewski]

Description

This is a prefactor to break up visitor.rs into multiple files. This is primarily just moving code around, but there are a few more in depth changes:

• 2873556 changes TaskWarning to only be constructed if there are missing envs, removing the need to check later on
• 88e98c5 changes so we no longer call which for every task to find the package manager binary. We instead call this on construction, but will only handle the error case on actual command creation.

I highly recommend reviewing each commit on it's own. All commits that move code do only that so hopefully that makes it easier to review.

Testing Instructions

Integration tests and some basic manual testing.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
examples-nonmonorepo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 23, 2024 0:36am

8 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
examples-basic-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-designsystem-docs	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-gatsby-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-kitchensink-blog	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-native-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-svelte-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-tailwind-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am
examples-vite-web	⬜️ Ignored (Inspect)			Oct 23, 2024 0:36am

[dimitropoulos]

I know you just moved it: but wow, visit's a chunky one! don't mean that in a bad way, it's got a lot to do, but just interesting