feat: dependency syncing checker

[anthonyshew]

Description

Dependency checker to see if everything is in sync in all your package.jsons. Reports errors when there are multiple versions of the same direct dependency in the repo.

Testing Instructions

Wrote some tests - but do try it out!

TODO:

• [ ] Integration tests
• [ ] schema.json
• [ ] Bikeshed names (command, flag, and turbo.json key)
• [ ] Documentation

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
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[anthonyshew]

Also doing some experimenting on branch shew/dep-checker.