fix(fw): DATALOAD pushed_stack_items

[pdobacz]

🗒️ Description

DATALOAD pushes an item, same as RETURNDATALOAD and CALLDATALOAD, not sure why I missed this when doing the recent DATALOADN fix. I think now the 4 data opcodes are ok

I noticed this after getting deep into the Bytecode.__add__ algorithm for calculating max stack height. I have a case which it seems to be mishandling (no jumps or callfs!), but I have so far been unable to fix the algorithm. If I give up, I'll just post an issue to reproduce the problematic case.

🔗 Related Issues

NA

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• 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.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.