Add EIP: Multi-Namespace Onchain Registry

[wilsonccccc]

When opening a pull request to submit a new EIP, please use the suggested template: https://github.com/ethereum/EIPs/blob/master/eip-template.md

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[eth-bot]

✅ All reviewers have approved.

[github-actions]

The commit 44695cc (as a parent of ffa9713) contains errors.
Please inspect the Run Summary for details.

[abcoathup]

Suggested change

	category: Core
	category: ERC

This is an ERC (application layer)

[wilsonccccc]

thanks for reviewing, resolved

[wilsonccccc]

@abcoathup Hi Andrew, may I ask for your kind review or any feedback when you have time. Much appreciated. cc @axic, @Pandapip1, @SamWilsn, @xinbenlv

[wilsonccccc]

@SamWilsn Hi Sam, Much appreciated for taking the time to review the diff, all comments are addressed, please review again when you have time. Best

[wilsonccccc]

@SamWilsn Hi Sam, Happy Friday, just a kind reminder if you can take a quick review of our EIP when you have time? That will be much appreciated. Best

[eth-bot]

All Reviewers Have Approved; Performing Automatic Merge...