[REFACTOR] Abstract the representation of field elements. Phase 2

[pefontana]

[REFACTOR] Abstract the representation of field elements. Phase 2

Issue: #268 Waiting for PR #427

Description

• Add multiple FieldElement methods
• Refactor Memory.get_integer to return a FieldElement. Because of this change every time a hint function gets a variable value from memory (get_integer_from_var_name) it now gets a FieldElement. So this refactor includes adaptations in all the hints implementation, so as to work with FielElements.

One thing to take into account. Scope variables still use BigInts, because they can operate with negative numbers instead of FieldElements.

Checklist

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

[codecov-commenter]

Codecov Report

Merging #441 (8959e33) into add-field-element (68571de) will decrease coverage by 0.08%. The diff coverage is 91.17%.

@@                  Coverage Diff                  @@
##           add-field-element     #441      +/-   ##
=====================================================
- Coverage              96.59%   96.50%   -0.09%     
=====================================================
  Files                     54       54              
  Lines                   9154     9241      +87     
=====================================================
+ Hits                    8842     8918      +76     
- Misses                   312      323      +11     

Impacted Files	Coverage Δ
...int_processor/builtin_hint_processor/hint_utils.rs	90.90% <0.00%> (ø)
...t_processor/builtin_hint_processor/memset_utils.rs	100.00% <ø> (ø)
src/hint_processor/builtin_hint_processor/set.rs	100.00% <ø> (ø)
src/hint_processor/hint_processor_definition.rs	100.00% <ø> (ø)
src/hint_processor/proxies/exec_scopes_proxy.rs	70.33% <ø> (ø)
src/utils.rs	99.51% <ø> (ø)
src/vm/vm_memory/memory_segments.rs	97.74% <76.92%> (-1.06%)	:arrow_down:
src/hint_processor/builtin_hint_processor/usort.rs	93.50% <80.00%> (-1.17%)	:arrow_down:
src/types/relocatable.rs	90.69% <81.53%> (-0.56%)	:arrow_down:
...cessor/builtin_hint_processor/find_element_hint.rs	97.96% <84.61%> (ø)
... and 20 more

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