chore(fw,tests): Transaction nonce as Iterator[int]

[marioevz]

🗒️ Description

Allows more broad usage of iterators in some fields such as:

• BlockchainTest: blocks -> Iterable
• Block: txs -> Iterable
• Block: withdrawals -> Iterable
• Transaction: nonce -> Iterator

This is now possible:

nonce = count()
...
tx1 = Transaction(nonce=nonce)
tx2 = Transaction(nonce=nonce)

Although, when refactoring some of the tests I realized most usages of this pattern didn't really need it 🙃

Anyway, it's nice to allow it. Wdyt? @spencer-tb @danceratopz

🔗 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: 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.

[marioevz]

Another pattern I saw is something like this:

txs= [
Transaction(
        ty=0x0,
        nonce=0,
        to=account1,
        data=data1,
        gas_limit=500000,
        gas_price=10,
        protected=True,
    ),
Transaction(
        ty=0x0,
        nonce=0,
        to=account2,
        data=data2,
        gas_limit=500000,
        gas_price=10,
        protected=True,
    ),

I think we can replace it with something like

Transactions(
nonce=count(),
to=[account1, account2],
data=[data1,data2]
gas_limit=500_000,
gas_price=10,
)

Would this be more useful? Basically just a generator that checks all kwargs and if the value is:

• isinstance(Iterator, arg), nothing to do (use next(arg) on each iteration)
• isinstance(Iterable, arg) (but not string, nor bytes), do iter(arg)
• Neither, use itertools.cycle

Until any of the iterators is exhausted. nonce can be optional and just defaults to a new itertools.count if None.

[marioevz]

Implemented previous comment in #435, and it's much more useful, and supersedes all changes in this PR.