fix: improve WIF support

[sebastijankuzner]

Summary

Fix WIF. Remove support on crypto-key-pair-bls12-381.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

❌ Patch coverage is 81.57895% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.45%. Comparing base (07b0d04) to head (339b65c).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/exceptions/source/crypto.ts	0.00%	6 Missing ⚠️
packages/crypto-key-pair-bls12-381/source/pair.ts	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1263      +/-   ##
===========================================
+ Coverage    53.16%   53.45%   +0.29%     
===========================================
  Files         1128     1131       +3     
  Lines        63677    64105     +428     
  Branches      1723     1801      +78     
===========================================
+ Hits         33854    34269     +415     
- Misses       29531    29541      +10     
- Partials       292      295       +3     

Flag	Coverage Δ
contracts	98.60% <ø> (?)
packages	53.15% <81.57%> (-0.02%)	⬇️

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