Node.js v20+ Compatibility Fix.

What's Changed

• feat: add Node.js v20+ compatibility with automatic WebSocket fallback by @silvercondor in #1
• chore: add root package.json for Node.js compatibility by @silvercondor in #2
• chore: suppress package import warning by @silvercondor in #3

Full Changelog: https://github.com/silvercondor/hyperliquid/commits/v0.24.0-node-compat