refactor: remove BigNumber

[sebastijankuzner]

Summary

Remove BigNumber from utils.

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

❌ Patch coverage is 53.40909% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.95%. Comparing base (ac0a67d) to head (0f785a4).

Files with missing lines	Patch %	Lines
packages/api-sync/source/restore.ts	20.00%	24 Missing ⚠️
...es/transaction-pool-service/source/sender-state.ts	7.14%	13 Missing ⚠️
...ages/test-transaction-builders/source/utilities.ts	0.00%	8 Missing ⚠️
packages/api-sync/source/service.ts	14.28%	6 Missing ⚠️
...nsus/source/services/consensus-contract-service.ts	0.00%	4 Missing ⚠️
packages/blockchain-utils/source/format.ts	75.00%	3 Missing ⚠️
packages/exceptions/source/crypto.ts	0.00%	3 Missing ⚠️
...ation-generator/source/generators/genesis-block.ts	81.81%	2 Missing ⚠️
packages/evm-consensus/source/deployer.ts	33.33%	2 Missing ⚠️
packages/evm-consensus/source/service-provider.ts	33.33%	2 Missing ⚠️
... and 11 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1286      +/-   ##
===========================================
+ Coverage    56.75%   56.95%   +0.19%     
===========================================
  Files         1124     1126       +2     
  Lines        65062    65327     +265     
  Branches      1776     1848      +72     
===========================================
+ Hits         36927    37206     +279     
+ Misses       27905    27889      -16     
- Partials       230      232       +2     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	56.67% <53.40%> (-0.08%)	⬇️

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