fix(crypto-transaction): encode r/s as minimal integers for standard-Ethereum hash compatibility

[oXtxNt9U]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.36%. Comparing base (1db5d82) to head (55e41ce).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1398      +/-   ##
===========================================
+ Coverage    61.32%   62.36%   +1.03%     
===========================================
  Files          927      931       +4     
  Lines        15289    15736     +447     
  Branches      1681     1765      +84     
===========================================
+ Hits          9376     9813     +437     
- Misses        5908     5916       +8     
- Partials         5        7       +2     

Flag	Coverage Δ
contracts	97.74% <ø> (?)
packages	61.33% <100.00%> (+<0.01%)	⬆️

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