🛠 Tooling: Remove need to explicitly list all eightbittr dependencies in package.json

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

EightBittr includes dependencies such as timehandlr that are often imported from in game code. Right now they're all always included as dependencies. But it's weird having so many of them in package.json files.

Alternately, setup scripts could just only put the eightbittr dependency in packages. That makes the most sense for first-time users. But then are users expected to import from random packages? In theory, the eightbittr package could expose all the things exposed... but that's a lot of stuff to expose.

Additional Info

Marking as difficult because this is going to be a surprisingly tricky thing to approach.