Package manager detection about corepack HOT 4 OPEN

I like this idea in general, both as a user and as a tooling author. cc @nodejs/tooling

The one concern I have from a Create React App perspective is that our whole thing is that we're a zero-config tool. We go out of our way to avoid prompting the user for anything ever.

The biggest reason for this is that a lot of our users are beginners, new to React, new to JavaScript and sometimes even new to programming. Every prompt is an obstacle to the user. If they don't even know what a package manager is or have never heard of npm or yarn or pnpm they might get stuck.

Aside from that, the idea of being able to programatically ask for the user's preferred package manager and use that by default is very appealing.

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After some back and forth in facebook/create-react-app#11322 create-react-app has been changed to check which package manager invoked it instead of defaulting to Yarn

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I've implemented a first draft in #26

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Could we use preferred-pm to set a default when packageManager isn't used, with its result being overridden by an explicit corepack elect? This would make the default logic more consistent with tools like pnpm and Astro, without requiring manual configuration. VSCode also uses which-pm which is a dependency of preferred-pm.

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