test: Add 64 byte test cases for SHA256 and RIPEMD160 precompile benchmarks

[GottfriedHerold]

benchmarks/compute/precompile/test_ripemd160.py: Add 64 byte test cases.

Due to how, internally, padding+splitting into blocks (of 64bytes) in the actual hash functions works, even multiples of 32bytes behave slightly differently wrt. gas pricing. So we need to add a 64byte test case here.

🗒️ Description

This just adds a 64 byte test case (to the existing list) to the relevant hash function precompile benchmarks.

🔗 Related Issues or PRs

Internally, both SHA256 and RIPEMD160 start input processing by padding (to store the length and to align the size with the internal blocksize) and then chopping the result into 64byte blocks. Each block is then processed sequentially. As a consequence, both 0byte and 32byte inputs result in 1 block, 64byte and 96byte inputs result in 2 blocks etc.
The number of such blocks largely determines the amount of actual work that needs to be done in hashing.
Since the gas consumed is computed on a 32byte granularity level (rather than the 64byte blocksize), the behaviour, for small input lengths, of
work_done/gas_consumed
may differ for even and odd multiples of 32bytes. The worst-case should be EVEN multiples.
Consequently, we should add a 64byte test case to cover this.

See STEEL discord benchmarking/Cryptography precompile worst case

✅ Checklist

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

  just static

• [X ] All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.17%. Comparing base (8fa9a05) to head (8d18048).

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2801   +/-   ##
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  Coverage            88.17%   88.17%           
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  Files                  577      577           
  Lines                35659    35659           
  Branches              3490     3490           
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  Hits                 31442    31442           
  Misses                3654     3654           
  Partials               563      563           

Flag	Coverage Δ
unittests	88.17% <ø> (ø)

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[kevaundray]

Thanks Gotti!