Use the user's current package manager to run binaries #61
Description
At the moment, we're using npx every time we run some binary (external commands like storybook, svelte-check, svelte-migrate, prettier). Ideally, we'd want to use whichever PM the user is currently using during their sv execution.
Currently waiting on antfu-collective/package-manager-detector#15 to be merged before implementing this change.