support corepack -g ls command

[gweesin]

related to #553

suggest adding a command like corepack -g ls to list all globally installed package managers' configurations. This would allow users to easily view the package managers available in their system and switch between them.

[aduh95]

What use case do you have in mind? I'm not sure I understand why it would matters which package managers are installed.

[gweesin]

My colleague is experiencing an issue where downloading pnpm using corepack always returns a 302 error. I want to verify if I encounter the same problem when accessing pnpm. However, I've installed almost every version of pnpm, and I'm wondering if there's a command to query the installed versions(corepack -g ls but it doesn't exist). This would help me determine which specific version I need to test that I haven't installed yet.

As a side note, the http 302 issue was resolved for my colleague after upgrading to the latest corepack.

[styfle]

In that case, I would set the debug environment variable (DEBUG=corepack) to enable verbose logs.

[kaokei]

It is a common case to determine which versions of pnpm are installed on a system, as well as confirm the default global pnpm version.