feat(cbor): add support for bignums

[BlackAsLight]

Closes: #6455

This pull request adds native support for encoding bigints that requires +64 bits to encode via the tag item 2 and 3. It also adds automatic decoding of tag items 2 and 3 for converting them back into bigints instead of returning the CborTag instance.

• Cbor Tags
• RFC8949 BigNums

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.68%. Comparing base (1dee498) to head (58c575e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6458      +/-   ##
==========================================
- Coverage   95.68%   95.68%   -0.01%     
==========================================
  Files         576      576              
  Lines       43053    43088      +35     
  Branches     6450     6461      +11     
==========================================
+ Hits        41194    41227      +33     
- Misses       1820     1822       +2     
  Partials       39       39              

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[kt3k]

Mostly looks good. Left one question

[kt3k]

LGTM