Add EIP: Escrowed Governance Incentives

[jhweintraub]

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]

File EIPS/eip-6504.md

Requires 1 more reviewers from @Pandapip1, @SamWilsn, @axic, @xinbenlv

[github-actions]

The commit b6d52d3 (as a parent of 4f9c540) contains errors.
Please inspect the Run Summary for details.