Refactored pedersen libfuncs to use the BlockExt trait

[tcoratger]

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.13953% with 18 lines in your changes missing coverage. Please review.

Project coverage is 91.82%. Comparing base (b2f1568) to head (56102a7).
Report is 9 commits behind head on main.

Files	Patch %	Lines
src/libfuncs/starknet.rs	0.00%	9 Missing ⚠️
src/libfuncs/ec.rs	25.00%	6 Missing ⚠️
src/libfuncs/array.rs	50.00%	1 Missing ⚠️
src/libfuncs/function_call.rs	0.00%	1 Missing ⚠️
src/types/box.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
==========================================
- Coverage   91.95%   91.82%   -0.14%     
==========================================
  Files         112      113       +1     
  Lines       34265    34586     +321     
==========================================
+ Hits        31509    31759     +250     
- Misses       2756     2827      +71     

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