feat(nano): change internal storage hashing to sha256

[jansegre]

Motivation

Benchmark shows similar (and slightly better) performance in some cases.

Acceptance Criteria

• Use SHA256 for storage hashing (both the patricia-trie and attribute-keys)

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	feat/nano-sha256-storage
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.86 m (+11.34%) Baseline: 1.67 m	1.50 m (80.83%)	2.01 m (92.78%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.63%. Comparing base (7707b6c) to head (2f65827).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1378      +/-   ##
==========================================
- Coverage   85.67%   85.63%   -0.05%     
==========================================
  Files         429      429              
  Lines       32450    32450              
  Branches     5068     5068              
==========================================
- Hits        27802    27788      -14     
- Misses       3620     3631      +11     
- Partials     1028     1031       +3     

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