refactor(fw): Refactor `ethereum_test_tools` into separate libraries

[marioevz]

🗒️ Description

Creates the following libraries out of ethereum_test_tools:

• ethereum_test_base_types
• ethereum_test_exceptions
• ethereum_test_fixtures
• ethereum_test_specs
• ethereum_test_types
• ethereum_test_vm

This will allow better interaction between them and reuse of code (e.g. Opcodes in ethereum_test_forks).

ethereum_test_fixtures still contains references to execution-specs, but it's possible to remove them so they can import this library alone and use it to consume the fixtures.

🔗 Related Issues

None

✅ Checklist

• [x] All: Set appropriate labels for the changes.
• [x] All: Considered squashing commits to improve commit history.
• [ ] All: Added an entry to CHANGELOG.md.
• [x] All: Considered updating the online docs in the ./docs/ directory.
• [x] Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• [x] Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• [x] Tests: Included the type and version of evm t8n tool used to locally execute test cases: e.g., ref with commit hash or geth 1.13.1-stable-3f40e65.
• [x] Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.