feat(fw): Add sha256 hash to fixtures

[marioevz]

🗒️ Description

Adds sha256 hash calculation to all generated fixtures, by simply converting to JSON string, with ordered keys and without _info, then hashing the string.

I benchmarked all algorithms that hashlib provides using this: https://github.com/SharkyRawr/python-hashlib-benchmark
and surprisingly sha256 was among the fastest ones (I thought it would be md5 but it turns out it's not).

It also adds a nice script that prints the hashes in several forms, the hasher entry-point (see more with hasher -h).

🔗 Related Issues

None

✅ 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: 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.

[spencer-tb]

Really nice! Played around with this today - I plan to rebase the fixture diff PR onto this branch tomorrow and use:

HashableItem.from_folder(folder_path=args.folder_path)

To create the fixture hash tree within #443.

As these are tightly coupled I'll maybe make a PR here, where we have all the "hashing" related logic within the hasher. This would leave the "differ" to solely focus on comparisons.

I added the info hash to some framework tests here: marioevz#16

[spencer-tb]

LGTM! Docs are really nice