feat(tests): unify gas cost variable

[LouisTsai-Csie]

🗒️ Description

Unify the gas cost variable name from Cancun to Osaka. Introduce a fork-dependent gas table.

The mapping for the EELS & EEST gas constant, I replace all the EEST variable name with the EELS naming, as this requires less effort. This documents the mapping: https://hackmd.io/@QmVpC8TxQ8a1nTCW46EsEQ/B1932RWy-x

🔗 Related Issues or PRs

Issue #1599

✅ 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: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.
• Tests: For PRs implementing a missed test case, update the post-mortem document to add an entry the list.
• Ported Tests: All converted JSON/YML tests from ethereum/tests or tests/static have been assigned @ported_from marker.

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[LouisTsai-Csie]

This is the example usage:

code = Op.PUSH0 + Op.PUSH0 + Op.ADD
prague_calc = OpcodeGasCalculator(Prague)
prague_gas = prague_calc.calculate(code)
# the total gas cost for the code sequnece

This could be extended to:

code = Op.PUSH0 + Op.PUSH0 + Op.ADD
calc = OpcodeGasCalculator(fork)
gas =calc.calculate(code)

This version could help us avoid hardcoding the gas cost. As i believe in the near future there would be gas repricing for ZkVM, and we do not want to update all the gas cost again.

[LouisTsai-Csie]

We need to define this op_cost function for every fork to enable fork-dependent gas table feature.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.14%. Comparing base (9563a51) to head (0f2fdd7).
⚠️ Report is 21 commits behind head on forks/osaka.
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Additional details and impacted files

@@               Coverage Diff               @@
##           forks/osaka    #1776      +/-   ##
===============================================
+ Coverage        86.07%   86.14%   +0.07%     
===============================================
  Files              743      743              
  Lines            44078    44261     +183     
  Branches          3894     3891       -3     
===============================================
+ Hits             37938    38127     +189     
+ Misses            5659     5656       -3     
+ Partials           481      478       -3     

Flag	Coverage Δ
unittests	86.14% <100.00%> (+0.07%)	⬆️

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