Shutdown RPC endpoint

[elmattic]

Summary of changes

Changes introduced in this pull request:

• Add Filecoin.Shutdown endpoint and forest-cli shutdown subcommand
• Expose version() and shutdown() in js console
• Add sleep and sleepTipsets builtins in js console
• Fix bug in module path resolver

Will rebase on main once js-console branch is merged.

Reference issue to close (if applicable)

Closes #2402

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[lemmih]

The cursor can go missing if we hit ctrl-c during a prompt.