feat(specs): add specs and tests for EIP-7709

[jsign]

🗒️ Description

This PR adds specs and tests for EIP-7709.

Note: this PR isn't meant to be merged for now. It is to share an implementation of spec and tests -- this PR is targeting forks/amsterdam just because it is the main branch now.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast static checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  just static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.24%. Comparing base (4bf8bbe) to head (072f997).

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2619   +/-   ##
================================================
  Coverage            86.24%   86.24%           
================================================
  Files                  599      599           
  Lines                36984    36998   +14     
  Branches              3795     3796    +1     
================================================
+ Hits                 31895    31909   +14     
  Misses                4525     4525           
  Partials               564      564           

Flag	Coverage Δ
unittests	86.24% <100.00%> (+<0.01%)	⬆️

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