Remove EIP712 authentication method

[piotr-roslaniec]

Type of PR:

• Feature
• Other

Required reviews:

• 2

What this does:

• Removes EIP712 support from the codebase

Issues fixed/closed:

• Fixes https://github.com/nucypher/sprints/issues/5

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network. E.g., if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

• Lynx example fails because of incompatibility with v7.3.0

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[manumonti]

Lyx nodes updated to v7.4.0. So now tests are passing 🙌