Node.js maintainers: Threat Model

[RafaelGSS]

Document: https://hackmd.io/@M_jNX2MrSVuhJwhDnKOLHg/Hk-E22bLA/edit

[mhdawson]

Doc with work so far - https://docs.google.com/document/d/1gsClTXEJ7aFl8WsNX6bXWXnGTi7H-ghXlaic5voeJNw/edit

[github-actions]

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