feat(spec): update eip7928 to latest rlp specs wrt storage; rename tx_index

[fselmo]

🗒️ Description

• Change storage slots to use U256 instead of Bytes32: related change in EIP-7928 here
• Rename tx_index -> block_access_index across the testing framework

For ease of review, most changes related to the types changes are in builder.py, rlp_types.py, t8n_types.py, and in the testing framework side within packages/testing/src/execution_testing/test_types/block_access_list/account_changes.py

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@                    Coverage Diff                     @@
##             eips/amsterdam/eip-7928    #1912   +/-   ##
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  Coverage                           ?   83.85%           
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  Files                              ?      402           
  Lines                              ?    25105           
  Branches                           ?     2287           
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  Hits                               ?    21051           
  Misses                             ?     3615           
  Partials                           ?      439           

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