refactor(fw): use ethereum-rlp instead of ethereum.rlp

[danceratopz]

🗒️ Description

Updates EEST framework libraries to use Sam's new ethereum-rlp library, which was moved out of the ethereum package in:

• Switch to ethereum-rlp execution-specs#1034

🔗 Related Issues

ethereum-rlp was already added as a dependency as a hot-fix to CI issues in:

• chore(all): add ethereum-rlp as a dependency #1080

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.

[danceratopz]

I did a quick sanity check of test fixtures using a subset of tests locally via hasher to ensure there were no changes. I used:

• tests/cancun/eip4844_blobs/ as they do rlp modification,
• tests/shanghai/eip4895_withdrawals/ as the withdrawals lists get RLP encoded.

[marioevz]

LGTM, thanks!