Init ssz-engine api specs

[RazorClient]

SSZ container definitions and helpers for the REST+SSZ Engine API refactor execution-apis PR.
This is foundational plumbing for the upcoming REST+SSZ blockchain-test support;
it does not add any fillable test cases yet.

🔗 Related Issues or PRs

Tracks execution-apis PR

✅ Checklist

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