Add ERC7803Utils and ERC7803

[ernestognw]

Fixes #????

PR Checklist

• [ ] Tests
• [ ] Documentation
• [ ] Changeset entry (run npx changeset add)

[changeset-bot[bot]]

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Latest commit: 100db0f0a592beaa3b8392169db8b77014b89afa

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[Amxx]

As discussed yesterday, closing this PR.