Add EIP-5678: Continuous Token Model

[jb0xx]

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

We have a GitHub bot that automatically merges some PRs. It will merge yours immediately if certain criteria are met:

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[jb0xx]

will update

[eth-bot]

Hi! I'm a bot, and I wanted to automerge your PR, but couldn't because of the following issue(s):

---

(fail) EIPS/eip-5678.md

classification
ambiguous

• eip-5678.md has no identifiable authors who can approve the PR (only considering the base version)

[xinbenlv]

I don't think this EIP at this snapshot is good enough to check in

[xinbenlv]

Please complete the spec

[github-actions]

There has been no activity on this pull request for 2 weeks. It will be closed after 3 months of inactivity. If you would like to move this PR forward, please respond to any outstanding feedback or add a comment indicating that you have addressed all required feedback and are ready for a review.

[github-actions]

This pull request was closed due to inactivity. If you are still pursuing it, feel free to reopen it and respond to any feedback or request a review in a comment.