Implement EIP-5656 for Cancun

[gurukamath]

What was wrong?

EIP-5656, which is slated for Cancun, is not currently implemented in the specs.

How was it fixed?

Implemented EIP-5656

[codecov-commenter]

Codecov Report

Attention: 2208 lines in your changes are missing coverage. Please review.

Comparison is base (673ccec) 69.91% compared to head (4eaed5f) 69.93%.
Report is 53 commits behind head on forks/cancun.

Files	Patch %	Lines
src/ethereum/cancun/fork.py	0.00%	225 Missing ⚠️
src/ethereum/cancun/vm/instructions/system.py	0.00%	208 Missing ⚠️
src/ethereum/cancun/vm/instructions/__init__.py	0.00%	160 Missing ⚠️
src/ethereum/cancun/vm/instructions/environment.py	0.00%	143 Missing ⚠️
src/ethereum/cancun/state.py	0.00%	126 Missing ⚠️
src/ethereum/cancun/vm/instructions/arithmetic.py	0.00%	109 Missing ⚠️
src/ethereum/cancun/vm/interpreter.py	0.00%	108 Missing ⚠️
src/ethereum/cancun/vm/gas.py	0.00%	97 Missing ⚠️
src/ethereum/cancun/vm/instructions/stack.py	0.00%	94 Missing ⚠️
src/ethereum/cancun/vm/__init__.py	0.00%	76 Missing ⚠️
... and 55 more

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/cancun     #851      +/-   ##
================================================
+ Coverage         69.91%   69.93%   +0.01%     
================================================
  Files               609      610       +1     
  Lines             33980    34309     +329     
================================================
+ Hits              23758    23993     +235     
- Misses            10222    10316      +94     

Flag	Coverage Δ
unittests	69.93% <26.12%> (+0.01%)	⬆️

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