Add big uint conversion

[jotabulacios]

Add BigUint conversion

Description

This PR adds try_from operator to create a field element from a BigUint

Type of change

Please delete options that are not relevant.

• [ ] New feature
• [ ] Bug fix
• [ ] Optimization

Checklist

• [ ] Linked to Github Issue
• [ ] Unit tests added
• [ ] This change requires new documentation.
  • [ ] Documentation has been added/updated.
• [ ] This change is an Optimization
  • [ ] Benchmarks added/run

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.17%. Comparing base (5f8f2cf) to head (4aa1445).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1002      +/-   ##
==========================================
+ Coverage   72.06%   72.17%   +0.10%     
==========================================
  Files         160      160              
  Lines       35145    35268     +123     
==========================================
+ Hits        25327    25453     +126     
+ Misses       9818     9815       -3     

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