Add Contributor Covenant Code of Conduct

[naserjr23]

This document outlines the Contributor Covenant Code of Conduct, including our pledge, standards of behavior, enforcement responsibilities, and consequences for violations.

[vercel]

@naserjr23 is attempting to deploy a commit to the Duneanalytics Team on Vercel.

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[cursor]

PR Summary

Introduces a formal code of conduct based on Contributor Covenant v2.0.

• Adds CODE_OF_CONDUCT.md adopting Contributor Covenant v2.0
• Defines community pledge, acceptable/unacceptable behaviors, and scope
• Specifies reporting process and enforcement responsibilities
• Includes enforcement guidelines with tiers: correction, warning, temporary ban, permanent ban
• Provides attribution and reference links

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