Expose package manager to AfterHookOptions

[gausie]

I'd like to give some aftercare for running create, for example

Go to the directory and run `npm run build` to finish!

However, I can't tell from that after hook what the user has used for their package manager.

[frolic]

See https://github.com/uetchy/create-create-app/issues/51#issuecomment-1376483500