🚀 Feature: --watch mode

[JoshuaKGoldberg]

Bug Report Checklist

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

Overview

Following #26, I'm very much looking forward to implementing a watch mode for create. The idea is described in https://create-josh.vercel.app/cli#-w----watch right now:

Whether to keep create running in a “watch” mode after its initial pass. When in watch mode, create will re-apply file creations whenever the “from” file or any of its imported entries change. This is only supported when the “from” is a relative path to a local ESM entry point on disk.

For example, using a sibling create-typescript-app directory’s package entry point to create a new repository under a child generated/ directory:

npx create --directory generated --from ../create-typescript-app --watch

Additional Info

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[JoshuaKGoldberg]

Well, I prototyped this out in #97. But it's more work than I'd hoped. Because Node doesn't export a way to clear the ESM import cache (https://github.com/nodejs/modules/issues/307), I don't believe this can realistically be done without manually massaging the process / process children / workers.

Removing from the Blocks Launch milestone. I want this to happen but it'll be a lot more work than I'd hoped.