Use ruint for conversions

[recmo]

No description provided.

[ziyadedher]

Running some benchmarks!

Locally created a new "pyrevm-ruint" runner in evm-bench by copying the existing pyrevm runner and modifying the pyproject.toml to point to the new branch. Then ran on just those two runners: RUST_LOG=info cargo run --release -- --runners pyrevm --runners pyrevm-ruint and I get this:

	pyrevm	pyrevm-ruint
erc20.approval-transfer	16.8ms	16.8ms
erc20.mint	15.8ms	15ms
erc20.transfer	22.6ms	23.8ms
snailtracer	128ms	128ms
ten-thousand-hashes	17ms	17.4ms
sum	200.2ms	201ms

I don't see any significant performance changes under these benchmarks, which kinda makes sense to me since I'm not so sure that much overhead is coming from the one-time conversions. More than happy to be proven wrong here, let me know if you need a hand playing around with evm-bench or (even better) if you want to try to benchmark independently!

(not to say this PR isn't a good thing in general, just was curious if we would see a perf improvement)