Add modulus range check when creating FieldElement from hex

[gabrielbosio]

This PR serves as a proposal to add a check for the creation of a FieldElement from a hex string.

See starknet-io/types-rs#81 for further details.

Note that this is one of two alternatives mentioned. The other alternative is to add this check in the from_hex function from types-rs.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.18%. Comparing base (160bb5c) to head (62697a5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1020   +/-   ##
=======================================
  Coverage   70.17%   70.18%           
=======================================
  Files         165      165           
  Lines       32770    32778    +8     
=======================================
+ Hits        22996    23004    +8     
  Misses       9774     9774           

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