Implement Blake2s hints (Part 3)

[fmoletta]

Depends on #312 ✅
Depends on a fix to cairo-vm ✅
cairo-vm version updated ✅

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (e01d7a5) 57.48% compared to head (3b603d7) 57.51%.

Files	Patch %	Lines
pkg/hints/blake2s_hints.go	62.50%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #314      +/-   ##
==========================================
+ Coverage   57.48%   57.51%   +0.03%     
==========================================
  Files          55       55              
  Lines        7145     7179      +34     
==========================================
+ Hits         4107     4129      +22     
- Misses       2625     2633       +8     
- Partials      413      417       +4     

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