Fixes#10197
# Important Notes
From now on, package installation will be using `pnpm install`. Installing it globally is fine for convenience, but it can also be used as `corepack pnpm install` without having to install anything other than node. For now, all other scripts are still invoked using `npm`, so we can still invoke them with usual `--workspace` setting. As far as I can tell that doesn't really have any other side effects and is identical as running the script through `pnpm run` in respective workspace project subdirectory.
This PR removes enso-pack (ensogl-pack) crate.
It still keeps the `enso-runner` JS package, as it is used for CLI argument parser and logger. The runner should be probably refactored (and possible removed altogether).
# Important Notes
I've temporarily extracted the `enso-runner` to `lib/js` directory, as I wanted to avoid keeping pure JS library under `lib/rust`. Attempts at integrating this with `app/ide-desktop` and family caused too much trouble for this PR. The expectation is that the package will be removed or moved elsewhere soon anyway.
