migrate to `pnpm@11`

[sacrosanctic]

• migrate to pnpm@11 for the project itself
• sometimes node:child_process sometimes tinyexec
• add .editorconfig
• https://github.com/sveltejs/cli#packages links to the old migrate
• tar-fs -> modern-tar
  - [ ] commander -> sade
  - [ ] kitnext should be kit3next
• nextsteps should accept string|false[]
• knip

[sacrosanctic]

@jycouet Should we use pnpm@11, if not. This can be closed.

[jycouet]

We can give a try yes 👍

[sacrosanctic]

maybe after 1.0, theres a lot going on