fix: bigint reviver

[glevco]

Motivation

During manual testing with the updated wallet-headless, I found a bug in the logic used to revive BigInts. We should check using JS Number.MAX_SAFE_INTEGER, instead.

Acceptance Criteria

• Make bigIntReviver() a standalone function in the JSONBigInt object.
• Fix logic bigIntReviver() uses to determine when it should return a BigInt.
• Add more tests.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.68%. Comparing base (50f9ff5) to head (0f5faa3).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/utils/bigint.ts	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #805      +/-   ##
==========================================
- Coverage   80.72%   80.68%   -0.05%     
==========================================
  Files          85       85              
  Lines        6549     6549              
  Branches     1420     1419       -1     
==========================================
- Hits         5287     5284       -3     
- Misses       1249     1252       +3     
  Partials       13       13              

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