Implement hints on common/ec.cairo

[fmoletta]

Implements 3 new hints in common/ec_op.rs
Code for sqrt was taken from open PR #715
This branch stems from pre-wasm/no-std-revert

[codecov]

Codecov Report

Merging #888 (815b9a2) into main (82089bf) will increase coverage by 0.01%.
The diff coverage is 98.31%.

@@            Coverage Diff             @@
##             main     #888      +/-   ##
==========================================
+ Coverage   97.39%   97.41%   +0.01%     
==========================================
  Files          69       70       +1     
  Lines       29279    29697     +418     
==========================================
+ Hits        28516    28929     +413     
- Misses        763      768       +5     

Impacted Files	Coverage Δ
felt/src/lib.rs	89.59% <92.85%> (+0.15%)	⬆️
src/math_utils.rs	99.43% <98.33%> (-0.15%)	⬇️
.../hint_processor/builtin_hint_processor/ec_utils.rs	99.01% <99.01%> (ø)
felt/src/bigint_felt.rs	96.07% <100.00%> (+0.02%)	⬆️
...int_processor/builtin_hint_processor_definition.rs	98.69% <100.00%> (+<0.01%)	⬆️

... and 14 files with indirect coverage changes

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[Jrigada]

LGTM, the layout "all" would need a change of name in the future