Authenticator for Ethereum Keys

Define an Authenticator that stores Ethereum-compatible 20-byte addresses as devices, and verifies [EIP-712][eip:712] compliant signatures as credentials.

## References

- [EIP-712][eip:712]
- [Signing data with MetaMask - DEV Community][dev.to:2ggl]
- [`eth_signtypeddata_v4` - MetaMask developer documentation][metamask:eth_signtypeddata_v4]

[eip:712]: https://eips.ethereum.org/EIPS/eip-712
[dev.to:2ggl]: https://dev.to/metamask/signing-data-with-metamask-2ggl
[metamask:eth_signtypeddata_v4]: https://docs.metamask.io/wallet/reference/json-rpc-methods/eth_signtypeddata_v4/

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Authenticator for Ethereum Keys #6

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