Add ERC: Multi-Owner Non-Fungible Tokens (MO-NFT)

[jamesavechives]

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[eip-review-bot]

✅ All reviewers have approved.

[github-actions[bot]]

The commit b9df715465ed75aa07bf4f5b9e554bb59e392911 (as a parent of 1bc4920c7a560e6f99c31aca7f93deb22df28fc2) contains errors. Please inspect the Run Summary for details.